After William Rainsberger was arrested for murdering his 88-year-old mother, he spent two months in jail before he was released on bail. A year later, prosecutors dropped the case, citing a lack of evidence. That decision was not surprising, because Rainsberger's arrest was based on a probable cause affidavit written by an Indianapolis detective who misrepresented crucial facts and omitted exculpatory information. The detective, Charles Benner, nevertheless argued that Rainsberger could not sue him under 42 USC 1983, a federal statute that allows people to seek damages when government officials violate their constitutional rights. In a 2019 opinion, the U.S....