General common courtesy and manners is a standard for them , though I hope people treat everyone that way . I come with some unfortunate news <| sep |> Most jurisdictions allow police officers to pat down anyone they talk to for weapons if they feel the need . They can ' t search you , but they can pat you down regardless of your consent . If the police are looking for the owner of the house to shut down the party , in that situation , they can enter the house to find them . Once again , they can ' t search i . e . look through drawers and stuff , but they have a reasonable rationale to try and find the owner . <| sep |> Ha ! As an American who ' s traveled quite a bit in Europe , I can tell you that the Italians and French have it better than you . Salespeople don ' t have to talk to you at all ! They get to stand outside and smoke cigarettes and glare at you through the glass till you put down your armload of merchandise out of frustration and leave !