The U.S.Supreme Court has held that officers need not knock and announce when investigating drug crimes due to the ease of destruction of evidence in such cases.

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The U.S. Supreme Court has not held that officers never need to knock and announce when investigating drug crimes. The "knock-and-announce" rule is a long-standing principle in Fourth Amendment jurisprudence, requiring law enforcement to announce their presence and wait a reasonable amount of time before entering, except in certain circumstances where they have a warrant that specifically allows for a no-knock entry due to concerns about the destruction of evidence or officer safety. However, this does not mean officers never need to knock and announce in drug cases; each case is evaluated on its specific facts.

The USSupreme Court Has Held That Officers Need Not Knock and and Announce