Good story man, I know the feeling of paranoia, but...No offense, you totally overreacted. It's not like the cop could do anything unless he saw you with a joint in your hand when you answered the door or if he had a search warrant. I also doubt they'd waste the time to get a search warrant unless they thought it was going to be a big bust, and even if they did get one, they would most likely send more than just one officer. You would have been fine just not answering the door and acting like you weren't home, it's not like it's illegal to not answer the door...