This story is a few days old, but I'm sure many of you remember when the story broke.
Short version: Atlanta cops dummy up some PC for a no-knock warrant at grandma's house. Thinking (correctly) that someone was trying to break into her house, grandma fires a single shot through the door. Police return fire, killing grandma. Police, finding no drugs in the house, shit themselves and plant marijuana in the basement.
Long version:
http://www.ajc.com/metro/content/metro/atlanta/stories/2009/02/22/kathryn_johnston_sentencing.html
Read on, it's an ugly look at what I fear is all too common among police forces, at least those who are big on paramilitary drug raids. The CATO Institute has an interactive map of botched raids here: http://www.cato.org/raidmap/Jason Smith was losing it. “I [screwed] up; I think I killed this woman,” the Atlanta narcotics cop told partner Arthur Tesler in the yard behind a small brick bungalow on Neal Street. “You guys got to help me.”
Inside, a 92-year-old woman lay dead, killed by a fusillade of police bullets. Officer Gregg Junnier, his face grazed by a bullet and bleeding, stalked through the home looking for suspects and contraband.
But there were no dealers, no kilo of cocaine. The tip that brought police to 933 Neal St. was as bogus as the story they used to sell a judge on the raid.
Desperation and self-preservation kicked in. Smith remembered the marijuana seized earlier that day. Better make it look like a drug house, he reckoned. He pulled baggies of pot from his sleeve, nodded to Tesler, and planted them in the basement.
The Nov. 21, 2006, killing of Kathryn Johnston, two days before Thanksgiving, outraged residents of the northwest neighborhood, shocked the nation and rocked Atlanta’s police force. It laid bare the corruption of an out-of-control narcotics squad that lied to get search warrants and planted drugs on suspects.
This time, Smith had authored the trumped-up affidavit. For all three, it was business as usual.
...
They got between 5 and 10 years - http://www.ajc.com/metro/content/metro/atlanta/stories/2009/02/23/johnston_sentencing.html