The Amazing Dr. Clitterhouse with Edward G. Robinson and Humphrey Bogart. Edward G. Robinson plays Dr. T. S. Clitterhouse, a physician who has a theory that a criminal's occupational stress causes physical changes in him. In order to test his theory he needs to perform physical examinations of criminals at various stages during the commission of their crimes. His difficulty finding subjects leads him to commit crimes himself, taking his own vital signs along the way. In his calm, analytical way, he's actually very good at crime. He ends up as the boss of a local burglary gang, although next-in-command 'Rocks' Valentine (Humphrey Bogart) is not overjoyed at this. Clitterhouse is having such a high time that he takes a sabbatical from his medical practice to lead his gang on a crime spree, taking blood samples from his men after every job. He gathers enough research data to write a book. When 'Rocks' tries to kill him, he decides that his research is finished and returns to his practice. His evil past follows him, though, and events culminate with him being put on trial for murder. His best defense? Insanity!
Gale Page (the only Lane Sister who wasn't a Lane) as Nurse Randolph.
Irving Bacon, who I mistakenly thought was Tom Fadden (the toll keeper from It's a Wonderful Life) when I wrote about Hard to Get. Here he was again and since he was actually in the credits (as Foreman of Jury) I was able to positively identify him. The two look alike to me.
Nurse Randolph discovers stolen jewels in Clitterhouse's medical bag