This isn't new news, but it's worth re-mentioning: No-knock raids are "a tactic that has grown in use from 2,000 to 3,000 raids a year in the mid-1980s, to 70,000 to 80,000 annually."
Maybe that doesn't bother you at all. But it should.
A no-knock raid is when police simply bust down your door at 5AM in sort of police version of "shock and awe."
A lot of "knock" raids are basically the same, but the "entry team" (which sounds almost as benign as some Walmart "greeting team") will shout "police, open the door!" as the battering ram goes into its backswing.