On the video, you can hear the police shout “Police! Search warrant!” However, courts are now issuing no-knock warrants with greater frequency. The result has been a number of incidents where homeowners have either been shot or have shot police by mistake. In Wilson v. Arkansas (1995) the Supreme Court held that “knock-and-announce” was one of the factors that it would use to determine if an entry is constitutional, but allowed the practice generally. Later, it gutted the deterrent for violations by ruling in Hudson v. Michigan (2006) that a violation of the knock-and-announce rule does not require the suppression of evidence. According to Professor Peter Kraska, a criminologist at Eastern Kentucky University, no-knock warrant increased from 3,000 in 1981 to more than 50,000 in 2005.
In this case, officers were found to have acted appropriately in shooting Blair because they saw a glint of an object in his hands.
Jonathan Turley