Odds of Hanging On
The odds of hanging on are about 100%. Remember—it's a lifetime appointment. We suppose you could get kicked out if you suddenly went on a killing rampage or something, but if you got appointed to the Supreme Court to begin with, then committing violent crimes probably isn't in your DNA. Which is good, because you wouldn't want your DNA falling into the hands of a forensic scientist after you've shot up a Wendy's.