Reply #13: They don't sneak. They break down the door

[ManiacJoe]

and rush in like home invaders. This technique is normally used against drug dealers to prevent the people inside from destroying evidence during the time it would take to politely serve the warrant.

Fortunately for the Good Guys, the courts have held that it is legal to treat (shoot) the cops as home invaders until the cops properly identify themselves. Unfortunately for the Good Guys, they don't always survive the process to point out the cops' mistake.