You decide what constitutes "reasonable cause to suspect" based on your observations, acquaintance with the people involved, understanding of the circumstances, and feelings regarding the event.
In the United States, there is a legal standard of proof known as "reasonable suspicion" that is less stringent than the legal requirement of "probable cause," which is required for arrests and warrants, but more stringent than a "inchoate and unparticularized suspicion or 'hunch'";it must be based on "specific and articulable facts," "taken together with rational inferences from those facts,"and the suspicion must be connected to Police may "frisk" a person for weapons but not for illegal substances like drugs if they have a reasonable suspicion that they are an armed and dangerous individual.
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