In this blog post from 2012, Professor Jessica Smith summarized Rules of Evidence 101 and 1101, which together dictate that the rules of evidence apply to “all actions and proceedings in the courts of this State,” except for proceedings that are specifically excluded by the rules or another statute. Pursuant to these two rules and the case law interpreting them, proceedings at which the rules of evidence (except for rules of privilege) do not apply include: applications for warrants; grand jury proceedings; first appearances; pretrial release hearings; probable cause hearings; hearings on motions to suppress; witness voir dire; sentencing hearings; probation revocation hearings; and more.
That’s quite a list. If the rules of evidence do not apply to any of these proceedings, are there any limits at all on the evidence that may be offered? Could an unsworn and mentally incompetent witness with no personal knowledge offer irrelevant and prejudicial triple-hearsay testimony about a prior conviction more than 10 years old, offered solely for the purpose of showing the defendant’s bad character and the likelihood that he acted in conformity therewith?
Surely not. But if there are no rules of evidence, why not? The short answer to nearly any question about the admissibility of evidence under Rule 1101(b) is “it’s in the judge’s discretion,” but what guides that discretion, and what are its limits?