Juvenile Rights

You are a police officer working in the city of Townsville. You see a group of youths on the corner of a busy intersection in the downtown area. They are standing around talking. You suspect they are involved in a drug transaction, because you recognize one of them who was involved with some drug activity previously.

1. What constitutional rights does the person you recognized have that might prohibit you from taking any police action against him at this time?

NOTE: You can list the rights in bullet points. Make sure you reference the Constitutional amendment too.