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As We tried to be quiet going up the front porch area and got into position, I did the Ca. required "Knock & Notice" This is the law that states that prior to banging down the door, the Officer(s) MUST announce their presence and the reason for being there e.g. "Oakland P.D. Search Warrant Demand Entry" then You give the suspected Crook(s) ample time to either flee the residence or to flush the dope.