Can a Knock and Announce Violation Ever Lead to Evidence Being Excluded?

Over the years, the use of no-knock warrants has grown exponentially. With a regular warrant, police are required to knock and announce their presence before entering a private building. No-knock warrants allow police to immediately make forcible entry. Because of this, their expanded use has been hotly contested. 

Affidavits in Support of Search Warrants Require Several Things

Many people think that once law enforcement has a warrant they can do whatever they want.  That is, if police search your home or business with a warrant that they can search everywhere.

Evidence obtained by the government to be used against you at trial must be obtained without violating your rights. In the home search context, this usually requires a warrant.  But the warrant itself must also be constitutional.