If the police are asking instead of saying "we have a warrant" and kicking the door down, it's because they don't have the necessary evidence and are fishing for some.

There is no implied threat of anything to those with the slightest bit of knowledge of how law enforcement works. This whole story could have just as easily went the other way.

>May we come in?

>I'd rather you didn't. Do you have a warrant?

>No we do not. What do you have to hide?

>I would rather not speak with you any further until you both have a warrant and I have a lawyer present. Good day sir. door shut

Respectful, yet assertive.