Chicago police officer obtains warrant based on sketchy tip from confidential informant, leading to lengthy search of family home that turns up nothing. (Officers now say the informant alerted them to the wrong home.) Can the family sue? Seventh Circuit: Surely not. The informant’s tip was detailed enough to provide probable cause; there was no need for the police to independently corroborate it. Besides, even if they lacked probable cause, qualified immunity is a thing. Judge Hamilton, dissenting: The officer and the confidential informant both have “significant credibility problems.” The officer may not have knowingly made false statements to obtain the warrant, but that is a factual determination and this is summary judgment. Court should remand for trial.