This is what happened with my first experience.

There were about 8 of us passing this nice wooden pipe with 2 bowls on it and we were sitting next to this small church in a nieghborhood and one of the people i was with was standing on the steps of the chrurch and someone in the neighborhood called the cops on him(we didnt know) the cop pulled up. He got out of his car and the weed is starting to kick in a couple of the guys started to back up to run but they didnt. the cop asked "were you guys live and what are you doing" i told him were i lived because no one else was answering but the cop had a K-9 in the back of his car and the dog smelled the pot on us and the thing was going crazy barking and jumping. The cop hit the top of his car with a nightstick to get the thing to shut up. Obviously the cop new what we were doing but he just told us to go home becuase i dont think he felt like busting 8 kids for pot and having to write up the 57 pages of reports for us. so he told us to go home. <--- close call.