About a year and a half ago, Jessica Schneider was handed a flyer by one of her colleagues in the child-advocacy community. It advertised a training session, offered under the auspices of the Illinois Principals Association (I.P.A.), in how to interrogate students. Specifically, teachers and school administrators would be taught an abbreviated version of the Reid Technique, which is used across the country by police officers, private-security personnel, insurance-fraud investigators, and other people for whom getting at the truth is part of the job. Schneider, who is a staff attorney at the Chicago Lawyers’ Committee for Civil Rights Under Law, was alarmed. She knew that some psychologists and jurists have characterized the technique as coercive and liable to produce false confessions—especially when used with juveniles, who are highly suggestible. When she expressed her concerns to Brian Schwartz, the I.P.A.’s general counsel, he said that the association had been offering Reid training for many years and found it both popular and benign. To prove it, he invited Schneider to attend a session in January of 2015.