A definition
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In the United States, a no-knock warrant is a warrant issued by a judge that allows law enforcement to enter a property without immediate prior notification of the residents, such as by knocking or ringing a doorbell. In most cases, law enforcement will identify themselves just before they forcefully enter the property. It is issued under the belief that any evidence they hope to find can be destroyed during the time that police identify themselves and the time they secure the area, or in the event where there is a large perceived threat to officer safety during the execution of the warrant.
Critics argue that no-knock warrants were prone to lead to deadly use of force by police and the deaths of innocent people. No-knock warrants also conflict with the right to self-defense, "stand-your-ground" laws, and Castle Doctrine which explicitly permit the use of deadly force against intruders
