loool it because they try to see what reaction you give , if you act weird or anything they do the search =p had the same type of problem aswell except i was sitting in the car minding my own business when out of no where a police van speed towards me block my car in and the police man runs to the window and starts sniffing the inside of my car , then asks a million and 1 questions when i got the car my age why i was in the area etc etc BUT THE BEST BIT OFF ALL AS I WAS PARKED NEXT TO A STRIP OF GRASS HE MANAGED TO STEP IN DOGG SHITT LMAOOO if you seem out of place or they have nothing better to do , they decide let just piss people off the fun of it