Mwangangi v. Nielsen

Investigating driver for impersonating police officer justified pat down for weapons because nature of the crime implies possibility of presence of weapon; handcuffing suspect does not always transform Terry stop into arrest, but it is a “rare case” where it would not, facts of this case did not justify handcuffing; officer at time of handcuffing did not have probable cause or even arguable probable cause to arrest plaintiff (who was in business of roadside assistance to motorists) for impersonating a police officer; formal arrest of plaintiff was based on probable cause information learned after he was handcuffed.