Reasonable suspicion can be based on a tip from an informer only if the tip:

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In order for a tip from an informer to provide reasonable suspicion, it must have some indicia of reliability. This means that the tip must be based on specific and articulable facts, rather than just a vague or general hunch, and it must come from a source that has demonstrated some level of credibility or reliability in the past. Simply being anonymous or involved in criminal activity would not necessarily make the tip unreliable, but it also would not provide sufficient grounds for reasonable suspicion on its own. The Aguilar two-prong test refers to a specific legal standard used by some courts to evaluate the reliability of informants, but it is not the only way to determine whether a tip is reliable or not.

Reasonable Suspicion Can Be Based on a Tip from an Informer