I am not sure if traffic stop rules vary from state to state or not...
At any rate, this incident took place in Washington state. A police officer followed my brother-in-law's vechicle and decided to run his plate. The officer then discovered that the registered owner of the vehicle's license was suspended and made a traffic stop and cited him for driving with a suspended license. The officer even stated that this was the "reason" that he made the stop - no weaving, erratic driving, speeding, etc.
My specific question was this a valid stop? Any input would be appreciated.