Police departments across the country have been buying up military style equipment for years, and increasingly use "no-knock" raids to arrest suspects accused of drug-crimes.

But the extremely aggressive tactics often lead to disaster and embarrassment.

Police are often amped up for a SWAT-style raid, and suspects or innocent people behind the wrong door often believe that they are being attacked.

Sometimes they fire a weapon at cops thinking they are being burglarized. Sometimes the cops fire at them because they see something in their hands. Sometimes the police just make elementary mistakes.

What follows is a baleful litany of botched raids that include chainsawing through the door of the wrong address, executing friendly family dogs in front of weeping children and slamming grandmothers into the wall.