So held SCOTUS in a 5-4 opinion in Hudson v. Michigan. This is an interesting opinion, one that should spark some debate. While I agree that suppression of evidence is a harsh penalty–especially when the police have a valid warrant describing that evidence–the dissent makes a good point that the police have little incentive to comply with knock-and-announce without the threat of suppression. I must say, I don’t buy all of Scalia’s arguments, and most certainly the contention that with professional police forces we have less to worry about than they did in the bad old days. For a analysis of the opinion see these links:
SCOTUS Blog
Right side of the Rainbow
Orin Kerr
SCAL Blog
LA Times article
Update: and Publius (Dude nails this one)
Update II: After having more time to review the opinion and reaction to it, I want to add a couple of points. First, this opinion presents no threat to the core liberties protected by the Fourth Amendment. Remember that under the facts of this case the cops had a vaild warrant for the search of the residence. That means, in theory, they had established probable cause for the search in front of a neutral and detached magistrate. What they did “wrong” was to crash through the door without giving Hudson a reasonable amount of time to answer the knock.
We must also remember that there are already exceptions to the knock-and-announce rule. For example, if the cops have reason to fear for their safety or a reasonable belief that evidence is about to be destroyed, then they can dispense with the typical knock-and-announce requirements. Hence, it is not as if the knock-and-announce rule is an absolute rule with no exceptions.
Furthermore, the suppression of evidence for violation of the knock-and-announce rule goes to the remedy for a Fourth Amendment violation. The text is silent on a remedy, and a proper remedy could be a fine for the cops, suspension of the cops, a tort suit against the cops, and maybe even a criminal prosecution against the cops.
Suppression of evidence for failing to knock and announce seems harsh and is certainly not a constitutional requirement. I believe that some penalty is warranted. But that penalty could be a number of things, not just suppression. The dissent is correct, inasmuch as we see the knock-and-announce rule as critical to the Fourth Amendment framework, that absent a real penalty on the state such as suppression, the cops will likely ignore the knock-and-announce rule in toto. And, surely the people are entitled to answer the state’s knock at the door in a dignified manner.
But, I just don’t see the knock-and-announce rule as so critical to the Fourth Amendment that suppression is warranted. As I do more criminal appeals, I become more in favor of limitations on law enforcement. Cops are fallen just like the rest of us–if we could trust them, then we wouldn’t need the many of the Fourth Amendment’s provisions. But in this case the remedy (exclusion of evidence) does not fit the violation (failing to knock, announce, and allow Hudson a reasonable time to answer the door in a dignified manner).