DO NOT let police in...even if they have complaints or whatever....They must have a search warrant to enter your house...but if you open the door and they smell weed or if they see a big stash of weed..they have probable cause (plain view clause).....if a cop ask to search your car...dont let him..he must have a warrant or probable cause....if he smells something, see something or if a dog makes a hit....probable cause...get it????