I am so sorry for your loss! I appreciate the correction (I thought it was only if the hands couldn't move, and they weren't sure) , but I am terribly sorry that you found out that way.
Not my opinion here - I am so sorry that happened to you and your family.
They do it because sometimes they say they never shot a gun, but the gsr proves they did. With my child, it's been an ordeal, never ending appeals and the bs that goes along with it. It's a horrible feeling hating someone you don't even know (my child's murderer).