probably depends on source. the thugs banged on my door a full half year after for me, because i got mine from the guy who's now embroiled in an international court case. talked to them more than i should have but luckily no one else was home and i got them to go the fuck away.
you don't have to answer, and you don't have to talk to them, and you certainly don't have to let them in. of course the law applies last to law enforcement, so tread lightly.