Erasing more than 90 years of Supreme Court precedent justice Samuel Alito broke a tie to allow police to enter your home without knocking. Instead of the judiciary balancing the power of the executive branch they're leaving it up to civil lawsuits to reconcile abuses.

David Moran, a university professor, says, "There are going to be a lot more doors knocked down. There are going to be a lot more people terrified and humiliated."

Currently evidence collected in violation of the Fourth Amendment cannot be used in trials. It appears at least 4 of the Supreme Court Justices would be happy to change that rule. Soon the police won't have to abide by the Fourth Amendment:

The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.

From Findlaw.com...

It was a rule at common law that before an officer could break and enter he must give notice of his office, authority, and purpose and must in effect be refused admittance, and until recently this has been a statutory requirement in the federal system and generally in the States. In Ker v. California, the Court considered the rule of announcement as a constitutional requirement, although a majority there found circumstances justifying entry without announcement. In Wilson v. Arkansas, Supp.2 the Court determined that the common law ''knock and announce'' rule is an element of the Fourth Amendment reasonableness inquiry. The rule does not, however, require announcement under all circumstances. The presumption in favor of announcement yields under various circumstances, including those posing a threat of physical violence to officers, those in which a prisoner has escaped and taken refuge in his dwelling, and those in which officers have reason to believe that destruction of evidence is likely. Recent federal laws providing for the issuance of warrants authorizing in certain circumstances ''no-knock'' entries to execute warrants will no doubt present the Court with opportunities to explore the configurations of the rule of announcement.