Please cite cases when cops were killed while picking up their brass.
Thanks for asking! Turns out I am wrong. It’s anecdotal at best. Here’s a link.
“The bottom line is this: there are no verifiable incidents of dead officers being found with revolver brass in their pockets after a gunfight. The next time someone tries to use this saw to “prove” some point about “bad muscle memory”, just drop some facts on them. Ask them where they heard it. Get sources, get sites. Don’t let bad information go unchallenged.”
http://www.gunnuts.net/2013/07/22/tactical-mythbusting-revolver-brass-in-the-pocket/