I agree. If the police think I committed a crime, they should go to the trouble of securing a warrant to search the premises of my place. If they don't, they're lazy in diligence and its not my job to make law enforcement's life easier or more convenient. As a citizen in a free country, I should have the right to say "NO" when the circumstances warrant it and when my interests would served by telling the authorities to wait til they get their warrant in hand.
(Denny Crane: "I Don't Want To Socialize With A Pinko Liberal Democrat Commie. Say What You Like About Republicans. We Stick To Our Convictions. Even When We Know We're Dead Wrong.")
You do agree that a) the warrant would have been granted and b) the husband would have destroyed the evidence in the meantime?
Well, hey. As long as our constitution is safe.