Allegation: Prisoner makes sink overflow, so Kentucky jailor beats the hell out of him. “We’re the law, dawg. We can do what we want.” At jailor’s trial, the gov’t uses evidence that the jailor beat up another prisoner on a prior occasion. Sixth Circuit: Evidence of prior crimes normally isn’t admissible at trial (lest it unfairly sway the jury). The exception the gov’t relied on doesn’t apply, so conviction vacated.