Shhhh! Whisper Stops and U.S. v. Bowman

I recently summarized a Fourth Circuit traffic stop case arising out of western North Carolina, U.S. v. Bowman, 884 F.3d 200 (4th Cir. 2018). It’s an interesting case in its own right as an application of U.S. v. Rodriguez, 135 S. Ct. 1609 (2015) (holding that extensions of a traffic stop must be supported by reasonable suspicion). In short, the Fourth Circuit reversed the trial court’s denial of the defendant’s motion to suppress, finding that the trooper lacked reasonable suspicion to extend the stop after the traffic stop was completed and vacating the defendant’s drug conviction. There are interesting issues in the case about when a seizure occurs and about whether the defendant consented to the extension of the stop, and readers are encouraged to check out the case, or at least the summary here (you can read all of the Fourth Circuit case updates here).

What caught my eye about it was a footnote in the opinion. Before the state trooper encountered the defendant, the Drug Enforcement Administration (“DEA”) passed along a tip to the local authorities in N.C. that the defendant’s vehicle was suspected of trafficking meth. That tip provided the vehicle’s license plate number and a description (“a red, older model Lexus”). According to the footnote, “The government agrees that the DEA tip should not be considered in any way in our legal analysis.” Slip op. at 3 n.1. Why would that be? After some digging and help from attorneys in the Charlotte Office of Federal Public Defender (thanks again to Ann Hester, Kevin Tate, and Mary Ellen Coleman from that office for talking about the case with me), I was able to determine that this was an instance of a so-called “whisper” stop. Although not exactly a new practice, its application in the digital age raises interesting questions. The tip aspect of the case is not discussed in Bowman beyond the brief mention in the footnote, but the case is a clear sign that the practice is occurring in North Carolina and elsewhere, so I wanted to cover it in today’s post.

What’s a Whisper Stop?

A whisper stop occurs when one law enforcement agency (usually a federal agency) passes along information to local authorities to use in identifying a suspect traveling in a vehicle. Once identified, the local authorities find an independent reason to stop the vehicle, without relying on the tip to justify the traffic stop. After the vehicle is stopped for a purportedly neutral reason (usually a minor traffic violation), the stopping officer then tries to develop independent reasonable suspicion to conduct what is typically a drug investigation, again without relying on the tip. These are also known as “walled-off” stops or “parallel construction” stops—the stopping officer doesn’t directly rely on the tip as justification for the stop, so the tip is “walled-off” from the grounds supporting the actual stop; the local authorities construct reasons to stop and investigate the vehicle “parallel” to (but independent of) the information in the tip, such that the tip presumably becomes less relevant (or irrelevant altogether) in the overall analysis. National Public Radio (“NPR”) recently ran a story about the practice here, and notes that among the federal law enforcement agencies, the DEA is the most prolific in using this method—apparently drug cases are where this type of stop is most likely to arise.

Why the Secrecy?

These types of tips are not intended to be used as a justification for a stop. Why? Presumably, either the tip does not rise to the level of justifying a stop or arrest—after all, if the DEA lawfully and reliably knows a suspect is trafficking drugs at a certain time and place, it seems likely they would have probable cause to arrest the suspect directly—or, the federal agency is unable or unwilling to disclose the details surrounding the tip for some other reason. When the information is part of an ongoing, larger law enforcement investigation, the federal agency often wants to protect the investigation. This is the traditional justification for these types of stops and the secrecy surrounding the tip—the government knows some drugs are passing through an area but doesn’t want to blow the bigger investigation yet.

But another potential reason for the secrecy is somewhat more nefarious—since revelations about the use of surveillance programs by U.S. intelligence services against citizens on a large scale, there have been concerns (at least among privacy advocates) that information swept up in mass surveillance programs may be leaked or shared with law enforcement agencies improperly. Don’t take my word for it; in addition to the NPR article linked above mentioning this concern, this Washington Post story on parallel construction stops notes the use of such surveillance in exactly this way, and Reason covered the same issue here, among other mainstream media accounts. Indeed, restrictions on intelligence sharing between surveillance agencies and law enforcement have been loosened in recent times according to this New York Times story. All conspiracy theory aside, there is apparently at least some legitimate concern that such tips may originate from mass surveillance programs, independent from any law enforcement investigation. But as long as the tip information is undisclosed, there just isn’t a clear way to know what the government’s motivation may be in keeping the information secret.

Does the source of the tip matter since the tip isn’t being used as evidence? It does for my comfort level at least, and there may be instances where it has some impact on the case.

The Fourth Amendment and Whisper Stops

How do these stops comport with the Fourth Amendment? In a sense, they can be seen as just another type of pretextual stop—it’s not a new phenomenon that one law enforcement agency would tell another to check out a vehicle, have the local authorities initiate a traffic stop based on an observed traffic violation, and allow any subsequent investigation to proceed as it may, or that an officer wanting to stop a suspect for one reason may find some other reason to justify the stop. Under established U.S. Supreme Court precedent, the officer’s subjective motivations in stopping a vehicle are irrelevant so long as there was an objectively reasonable justification for the stop. Whren v. U.S., 517 U.S. 806 (1996). North Carolina adopted Whren under the state constitution in State v. McClendon, 350 N.C. 630 (1999). Whren has been the subject of considerable criticism (for instance, this law review article), including most recently by Justice Ginsburg in her concurring opinion in the recent case of D.C. v. Wesby, 538 U.S. ___ (2018) (as Shea noted in a recent post here). But like it or not, Whren is the law of the land, and under Whren, the practice is generally permissible as a matter of Fourth Amendment law. So does that mean that for purposes of analyzing the stop it’s simply irrelevant whether a whisper stop occurred in a case? Not necessarily.

Do Whisper Stops Need to be Disclosed to the Defense?

One concern is whether tips of this kind are disclosed to the defense at all and, if so, how much information is provided. According to the trial attorneys in the Bowman case, the information regarding the tip was provided to the defense attorneys on the morning of the suppression hearing. In some instances, the tips aren’t disclosed at all until post-conviction—that’s what happened in a 9th Circuit case in 2014, according to an Arizona news report here. I’m not sure how a court would rule on the issue, but the idea the tip might be withheld from the defense makes me uncomfortable. Such information may be required to be disclosed as Brady material or as a matter of due process generally. Whether or not disclosure is constitutionally required, the tip information presumably would be discoverable in a state prosecution as a matter of North Carolina’s statutory open-file discovery scheme (under which the State is obligated to provide “the complete files of all law enforcement agencies”).

Aside from the question of discoverability, there’s the separate issue of how the tip bears on the testimony of the law-enforcement witness. Secrecy surrounding the origin and use of the tip during sworn testimony could amount to a misrepresentation or willful omission. Napue v. Illinois, 360 U.S. 264 (1959), held that the knowing use of false testimony at trial can violate due process. Along with potential due process concerns, attorneys of course owe a duty of candor toward the tribunal as a matter of professional ethics, and all witnesses of course have a duty to be truthful under oath. At the end of the day, a court could find it fundamentally unfair that in a proceeding to determine the lawfulness of a stop under the totality of the circumstances, information directly resulting in law enforcement focusing on a vehicle was withheld from both the defense and the court.

How the Court in Bowman Viewed the Whisper Stop

In theory, disclosure of the tip shouldn’t hurt the government’s case if the arresting officer developed independent grounds both to stop the target and investigate further. But is it realistic for the stopping officer to put aside any “whispered” tip information and objectively investigate? If you listen to the oral argument in the Bowman case (available here, although fair warning, the player was a little fickle on my computer), the government faced some skepticism from the panel on just this point (the government’s argument begins at 14:40, if you’re interested). Right out of the gate during the government’s argument, the court noted that this wasn’t exactly a normal traffic stop—in a more routine traffic stop, any suspicions arise more or less naturally—the officers observe what they observe and filter the information as they normally would in determining if something arouses suspicion. The suspicions of the officers are then either confirmed or dispelled. With a whispered tip, however, the officer needs to manufacture his or her own “clean” reasons for the stop and investigation. But as a judge on the panel pointed out, it’s not like the officer on the roadside forgets about the tip. In this sense, the officer “has his thumb on the scale” in the reasonable suspicion analysis, again to borrow the words of one of the judges at argument. Does the tip affect the way the officer is processing the information observed? Does the officer remain a reliable narrator in light of the “extra” information he or she has? Is the officer really dispelling independent suspicions? Or only looking to confirm them? The court pointed out that the officer likely never would have been following this vehicle in the first place without the tip—the trooper was looking for a reason to stop Bowman’s car. Additionally, the court expressed suspicion about the grounds for the traffic stop (speeding and weaving), but that issue was not challenged in district court and wasn’t before the panel.

One judge also expressed concern about the impact of the tip on how officers approach and interact with the occupants of a stopped vehicle—is it possible that the officer brings a more aggressive or suspicious bearing and tone to the situation? And if so, could that behavior by the officer result in increased nervousness of the occupants, which in turn is used to support reasonable suspicion? Consider how it played out in Bowman: The nervousness of the occupants was a major factor alleged by the government in support of reasonable suspicion to extend the stop, a factor the court ultimately rejected. The questions by the court above ultimately did not make their way into the written decision, but some of the court’s concerns may have affected the way it interpreted the evidence in conducting the fact-specific reasonable suspicion analysis.

Discovery and Litigation of Whisper Stops

Defenders concerned about the use of this technique have a few options. To determine whether a whisper stop has occurred, consider adding a line to the initial discovery request asking about whisper, walled off, or parallel construction stops. Be on the lookout for this type of stop in officer reports and discovery—which is tricky because it’s unlikely to be explicitly spelled out in discovery—but if there is a reference to outside information or an unsubstantiated tip, consider following up with a more specific discovery request. According to the Reason article linked above (as well as this article on DEA training in this area), information from federal agencies concerning whisper stops has been obtained by way of Freedom of Information Act requests (“FOIA”). A public records request on the state level may be an option for obtaining general information on whisper stops.

When litigating a motion to suppress, consider asking testifying officers whether they received any outside information or tips from other law enforcement agencies about the vehicle in question. If such information was given to the officer, consider whether it bears on the credibility of the officer’s observations in light of the tip. The questions posed by the court in Bowman to the government, above, seem to me a good place to start in addressing the factors alleged in support of reasonable suspicion. In many instances, it won’t be a close call—where there is an abundance of independent reasonable suspicion to detain a driver, the tip may not have affected the officer’s course of action. But in a close case, it may “tip” the scales.

Have you seen a whisper stop case in your jurisdiction? Have other ideas about how to find out about them and challenge them? Post a comment and share your thoughts!

10 thoughts on “Shhhh! Whisper Stops and U.S. v. Bowman”

  1. Why should the DEA tip not be used in the legal analysis for supporting reasonable suspicion? I understand the circumstances behind the whisper stop, but in this particular case the government seemed to invite defeat while putting all their eggs in one basket. At the suppression hearing, the Trooper specifically testified about the tip and what was included in the tip. Ignoring for a moment, potential discovery violations or due process arguments, the motion to suppress should be denied because regardless of the motivation to maintain a “whisper” stop, the Trooper clearly established reasonable suspicion when he articulated a tip that came from the DEA during the suppression hearing. The subjective motivations of the officer are irrelevant as long as there is an objective reason. This just makes no sense to me why the government would ignore the tip considering that the Trooper already openly testified to it. What exactly are you trying to protect at this point? The tip clearly supports RS and everyone just ignored it as if everyone wanted to use the case for some other purpose.

    I also find it significant to point out that dash cameras with audio and body cameras are allowing courts to analyze seizures with a high decree of accuracy due to the ability to capture exact quotes and body language.

  2. The problem I’ve always had with Whren is that it completely ignores the reason why an Officer was looking at a particular vehicle to begin with. I know here in Boone — and I assume elsewhere — if an Officer really wants to stop a particular car all he has to do is follow it around for a few minutes — something will inevitably materialize. The reality of day-to-day traffic around here is that pretty much EVERY car on the streets violates the traffic laws in some form or fashion merely in the process if going from place to place. Whether its pushing the speed limit a couple of mph in a low speed zone, making a lane change or turn without a turn signal, or failing to maintain lane control while trying to get around an illegally parked vehicle (or a legally parked one if it’s a large vehicle, such as a bus), an Officer can always find SOMETHING if he’s bound and determined to stop a particular vehicle.

    In my mind, that raises the question of why was he wanting to stop THAT particular vehicle, and not the myriad of others which are similarly in technical violation of the traffic laws at any given time. If his attention was actually drawn to the vehicle because of questionable driving, or a minor traffic or equipment violation, or even suspicious behavior by an occupant, fine. But what if his attention has been drawn to the vehicle for other reasons, such as the race of the driver, bumper stickers the Officer finds personally offensive, the fact that the car has an out-of-state tag, or because he received an unsupported whisper-tip from the DEA.

    If cause can be developed to stop essentially any vehicle just by following it long enough, then shouldn’t we be questioning why that particular vehicle had been singled out to be followed? Shouldn’t that be the key inquiry for the purpose of determining whether the subsequent stop was valid, since it’s the real reason the vehicle was stopped in the first place? Was it really because one of the car’s mirrors was missing? Or was it because the driver was black?

    Isn’t one of the objectives of our legal process to protect people’s rights? Or is it more important to just find a way around those rights so they can be ignored when it’s convenient? Are we seeking the truth of what happened by ignoring the REASON it happened? Or merely looking for an excuse to justify actions based on the outcome of a stop or search?

  3. I guess my thoughts are:
    If an officer receives information from a ‘whisper”, that is information. As the officer investigates the information, and he/she is able to confirm the information as true and accurate, it can lead to PC. Once the officer has PC, the stop and subsequent investigation and seizure carry more weight. In this case, the DEA was able to predict future events, and the officer was able to confirm that info. (Vehicle description, color and registration plate, location, ect). The DEA becomes the “informant”, which is important in this case. The officer stops the vehicle and observes what he/she has been trained to look for when investigation a drug trafficker, ie: food wrappers, multiple energy drinks, stories that do not make sense, ect. When considered independently, they do not mean much, When considered as a whole, it paints a picture. All of these factors develop additional PC, and confirm the information received from the DEA. It seems to me that the Courts are looking at each piece of evidence/information separately and have failed to look at the totality of the circumstances. Good police work is not being considered by the Courts. Any case can be dismantled if taken apart piece by piece, and the whole picture is hidden from view. Seems to me that the trooper did a good job and the information panned out, or this case would not be being discussed here.

    I did a controlled purchase from a person in a vehicle. My informant advised the target had more drugs in the vehicle, described the drugs and the location of the drugs in the vehicle. The target was followed by another officer, who in turn notified a marked unit of the vehicle and drugs. The officer in the marked unit stopped the target vehicle, interviewed the driver, received consent and searched the vehicle, The officer located and seized a large amount of drugs from the vehicle. That stop was based on information I received from a confidential reliable source, which I corroborated by viewing the hidden camera video of the buy. Is the Court saying that information from a “whisper” is less reliable than the word of a source? Is that where we are these days? I could understand if the DEA stated the information was not reliable, but if the DEA states the info is reliable, then, it should be considered reliable. The reason the DEA did not act on the info should not be relevant in any way. The info is the info, and the reliability of the info does not change dependent on who acts on it.

    This is another bad decision by the Court. The Courts are refusing to look at the totality of circumstances and are dissecting cases one piece at a time. It is a shame.

    • This decision does NOT hold any bearing on the reliability of a DEA tip. The government lawyers chose not to use the tip to support the seizure. The government’s initial written response to the defendant’s motion to suppress mentioned the DEA investigation, but failed to state anything about the Trooper receiving the tip.The government’s response reads as if the Trooper had no idea that a drug investigation was going on. This case was decided solely based on facts excluding everything to do with the tip and it didn’t have to be so. At the suppression hearing, a DEA Task Force Officer (actually a Hendersonville Police Officer) stated, “We would alert the Highway Patrol and then ask them to develop their own reasonable suspicion to conduct that traffic stop and to start their investigation.” He further stated that they had received information from a confidential source and they had already conducted surveillance. He went on to say, “He (Trooper) was told that the vehicle — that we had 15 received information that the vehicle would be 16 transporting crystal methamphetamine.”

      The government then later acknowledged that the defendant was never provided any information in regards to the Trooper’s knowledge of the tip. The government stated, “To that end, the government is not now going to argue that the informant information provided by the DEA somehow, by itself, supported reasonable suspicion to stop the vehicle or that it supported reasonable suspicion to extend the stop. As such, there is no need to assess the credibility of the tip, consider the informant’s basis of knowledge, or consider whether or not
      sufficient indicia of reliability exists.” I applaud the Assistant US Attorney for taking responsibility for the lack of disclosure and protecting the law enforcement officers; however I think this information should be disclosed. More specifically this information needs to be documented in the police report. Law enforcement’s credibility and the citizen’s ability to trust supersedes everything. You can certainly hide this during the stop and let the bigger investigation finish before disclosure, but this information needs to be provided by the time discovery comes around.

      I agree with Jon that the court seemed to analyze RS factors separately and ignore the totality of the circumstances standard. It almost seems to me that the opinion was an attempt to rebuke the whole “whisper” concept even though there are some Supreme Court precedents that prevented them from completely eviscerating the technique. I also believe there was enough information in the record for the court to support reasonable suspicion based on the tip even though the government chose to forfeit it.

    • ” The DEA was able to predict future events “…using a crystal ball or an unreliable informant or what? The police are always going to assume guilt and allege guilt no matter what if given any chance to do so. A tip not rising to RAS should carry zero weight in the analysis. Siccing other agencies on citizens when they do not have enough legal grounds to act themselves is not reliable or fair. An officer puling someone over on one of these pretext stops has no real interest in the failure to signal and is only conducting a drug investigation from moment one. They will drag out the encounter and summon a dog to try and beat the Rodriguez limits in order to confirm the tip, which may have been based on nothing more than a rumor. The DEA is always going to classify tips as do otherwise would defeat the purpose of ” search as many as possible to get the few”. It is an odds game, and lowering the odds for any reason the courts will swallow benefits them. The police of course will use any commonly innocent indicators as suspicions; He avoided eye contact. He stared at me . The car was messy. He had an air freshener. He seemed nervous. And on and on…anything to get the search underway. Our rights are being undermined because of the failed and harmful ” war on drugs ” and will continue as long as hunches and guesses and whispers are allowed to be considered.

      • It’s nothing but legalize gangs!!!! And what makes this even worst is the DEA will lie, cheat, and steal while so called looking for criminals. But will commit crimes in the process. There should be some type of control over these agencies as well. These agencies get upset as well when they are wrong and are not required to be held responsible for their actions. Where is the Justice in that. I agree totally with you. Some accountability is needed in law enforcement today or it will be worthless in the future.

  4. Hi – I’m the Human Rights Watch researcher who wrote the report that several of these news sources were covering and that also discussed many of the cases/developments mentioned here. Defense attorneys handling cases involving suspected parallel construction should always feel free to reach out to me; I’ll gladly share motions, etc. from other cases that may be helpful. Here’s the report: – Sarah St.Vincent, Researcher/Advocate on National Security, Surveillance, and Domestic Law Enforcement at Human Rights Watch (

    • Hi Ms. Vincent. My name is Candace Ogle and I have a client facing trial in W.V. on October 1st and this very issue is at the heart of the case. My motions are due in two days. Any advise would be most welcome.

  5. Hi
    My name is TJ
    And I’m experiencing the whisper effect
    Right Now!
    I’ve hired an defense attorney
    But haven’t had a chance
    To reveal what I know now
    Of the reason
    I was entrapped
    Also, My motion of discovery
    Hasn’t been giving to my attorney.
    I’d love to go public
    With this illegal activity
    Of law enforcement

  6. My name is Celestio Harrington, and I was recently involved in a whisper stop. On March 29, 2023, I was pulled over for swerving and was asked to get in front seat of the troopers car while he issued a warning ticket. After questioning me and issuing me a warning citation, the officer, before giving me my license back so I could leave, asked if he could search the vehicle, to which I did not give my consent. The officer told me to “sit tight,” and then proceeded to allow a fellow officer, who had arrived to the scene, to run a K9 around the vehicle I was driving. The K9 alerted, and I was arrested for trafficking. I was cooperative after this point, but I believe the stop absolutely falls under these same circumstances. I am currently involved in a serious legal battle for my life and would appreciate any insight, advice, recommendations and/or assistance


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