Fourth Circuit: Damon Wilson v. Prince George's County, Md

Officer used excessive force in shooting plaintiff, who at the time, was a burglary and assault suspect about 20 feet from the officer, advancing towards him while stabbing himself repeatedly with a pocketknife.

Qualified immunity, as insufficiently bright line when dealing with questions of mental illness.

Remand to determine state law immunity for precisely parallel violations of State Declaration of Rights.

http://www.ca4.uscourts.gov/opinions/171856.P.pdf