Polk County, Wisconsin v. J.K.J.

Issue: Whether the "single-incident" theory of liability under Monell v. Department of Social Services may be used to hold a municipality liable under 42 U.S.C. § 1983 on the theory that its failure to do more to prevent an employee from committing crimes that he had been trained and knew were expressly forbidden by municipal policy (and the law) was tantamount to embracing a policy of condoning constitutional violations.