Most recently there was the case of Leticia Lopez:
October 15, 2002
Police storm Lopez's home and handcuff her in front of her 8-year-old son after getting a tip from some homebuyers who saw a propane burner, cooking pot, and other items in the woman's backyard they said suggested a methamphetamine operation.
After police handcuff and detain Lopez, they discover that the burner and pot were leftover from a steak cookout a few days earlier, and the chemicals the officers and informants had mistaken for meth ingredients were paint solvents.
After the raid, Lopez begins to have anxiety and panic attacks, and is admitted to a hospital for treatment.
Even more egregious is the case of Brian Eggleston, which resulted in the unnecessary death of a police officer and the jailing of a man who thought he was being robbed:
On October 16, 1995, police raid the home of 24-year old Brian Eggleston's parents. Eggleston, a small-time marijuana dealer, is in the home at the time, as are his parents. As police force entry, Eggelston says he thought they were intruders there to harm his parents. He comes out of the bedroom firing, and shoots and kills Dep. John Bananola. Eggleston himself is shot in the chest, knee, abdomen and groin.
Police find a small amount of marijuana, and later charge Eggleston with selling the drug to an informant.
Prosecutors made three attempts to convict Eggleston of first-degree murder, which could have resulted in the death penalty. On the third try, a jury found Eggleston guilty of second-degree murder. He's serving a 39-year sentence.