What conservatives have won

The Don't-Bother-to-Knock Rule

The question in the case was what to do about it. Mr. Hudson wanted the evidence excluded at his trial. That is precisely what should have happened. Since 1914, the Supreme Court has held that, except in rare circumstances, evidence seized in violation of the Constitution cannot be used. The exclusionary rule has sometimes been criticized for allowing criminals to go free just because of police error. But as the court itself recognized in that 1914 case, if this type of evidence were admissible, the Fourth Amendment "might as well be stricken."

The court ruled yesterday that the evidence could be used against Mr. Hudson. Justice Antonin Scalia, writing for the majority, argued that even if police officers did not have to fear losing a case if they disobeyed the knock-and-announce rule, the subjects of improper searches could still bring civil lawsuits to challenge them. But as the dissenters rightly pointed out, there is little chance that such suits would keep the police in line. Justice Scalia was also far too dismissive of the important privacy rights at stake, which he essentially reduced to "the right not to be intruded upon in one's nightclothes." Justice Stephen Breyer noted in dissent that even a century ago the court recognized that when the police barge into a house unannounced, it is an assault on "the sanctity of a man's home and the privacies of life."

If Justice Sandra Day O'Connor had stayed on the court, this case might well have come out the other way. For those who worry that Chief Justice John Roberts and Justice Samuel Alito will take the court in a radically conservative direction, it is sobering how easily the majority tossed aside a principle that traces back to 13th-century Britain, and a legal doctrine that dates to 1914, to let the government invade people's homes.