Court reviews when police may enter someone's home without warrant

From the Washington Post:

Kentucky police were following a man who had just sold drugs to an undercover informant. They entered an apartment breezeway, heard a door slam and found they had two choices.

Behind door No. 1 was the dealer. And, unfortunately for him, behind door No. 2 were Hollis King and friends, smoking marijuana.

Smelling the drug, the officers banged loudly on King's apartment door and identified themselves as police. The officers said they heard a noise and feared evidence was being destroyed. They kicked down the door and found King, two friends, some drugs and cash.

King was sentenced to 11 years in prison, but the Kentucky Supreme Court overturned his conviction. It said that the officers had entered the apartment illegally and that the evidence they found should not have been considered in court.