Wrong. They are only considered to be less lethal than a firearm. Where do you get this stuff? TV?
Scott had nothing in his hands, when he was running away from Slager and shot by Slager. There was no deadly threat.
Slager had a bad day. He failed to catch Scott and cuff him without using deadly force. He failed to call for backup while further pursuing. Slager’s buddies immediately charged him and appear from their statement to have made a case. Looks like tough politics in that dept.