I’ve had several questions lately about the authority of law enforcement to track a suspect by obtaining information about contacts between the suspect’s cellular telephone and cellular towers. I’m also going to be teaching about some related issues in the near future. So I’ve prepared a short summary of the law in this area, which I’m making available here as a PDF. I’ve watermarked the document “draft” because I reserve the right to tinker with it some more, so if you read it and have comments, criticisms, or suggestions, please let me know. That said, I believe the summary is accurate as is. I hope it’s helpful.