The cops will let them back in even if the cops have to batter the door down for them , if you don’t do a formal eviction. and they may fight you the whole way. If you do a formal eviction the losers may fly into a rage, attack you when you present the papers, or at minimum will stall and destroy to the very last minute.
If you don’t call the cops the cops won’t get involved. The owners always make the mistake of calling the cops.