But they can 'see something suspicious' inside, and then suddenly be duty bound to investigate. Do not open your door for cops, and if you feel you should, step

But they can 'see something suspicious' inside, and then suddenly be duty bound to investigate. Do not open your door for cops, and if you feel you should, step outside swiftly and lock the door behind you. They will always find something if they want to, even it it was not there before they entered.