Mayor and City Council of the City of Baltimore, Maryland v. Humbert

Issue: (1) Whether each officer investigating a rape had probable cause to apply for an arrest warrant when substantial facts weighed toward probable cause, and some facts known only to one or two but not all three of the officers pointed away from probable cause; (2) whether officers investigating a rape had probable cause to apply for an arrest warrant under the facts of this case; (3) whether, for purposes of qualified immunity, the U.S. Court of Appeals for the 4th Circuit improperly attributed knowledge possessed by one officer to other officer defendants who did not have that knowledge; and (4) whether, for purposes of qualified immunity, the U.S. Court of Appeals for the 4th Circuit applied the law at too high a level of generality without sufficiently focusing on the facts the officers actually knew.