Similar thing happened to me actualy. Except the cop had a car. I was waiting for my friend to pick me up and a cop drove by thought i was out tagging. he searched my bag (i was scared and didn't say anything) found my el cheapo acrylic bong (had alot of sentimental value however) and about 3grams of the dankest nuggets ive had the pleasure of having (was going to my friends to smok'em), he made some threats. shoved me around threatened to "bring me in" then took down my details and left. never heard from them since