In this case, police in Kansas City, Mo., were investigating a murder. But they had already arrested a suspect. The search warrant was for what police believed was the suspect’s home. It turns out that the suspect hadn’t lived in the home for several years, and the police did little to verify who was currently living in the house. The residents — a 24-year-old woman, two elderly women and a 2-year-old — were then subjected to a violent, forced-entry SWAT raid.
The police did not have a no-knock warrant, so under the law, they were supposed to knock, announce themselves and give sufficient time for a resident to answer and let them in. In this case, after knocking, one resident of the house came to the locked screen door and showed them her keys, indicating her intent to open the door and let them in. The SWAT team forced entry anyway, then deployed the flash-bang grenade, which lit a set of drapes on fire.