Pre-Code is basically shorthand for sexy movies from the early 1930s. Lots of double-entrendre wisecracks (Blondell telling a woman that she’ll never lack for work as long as there are sidewalks) and lots of women getting dressed and undressed (Night Nurse probably holds the record here). The greatest pre-code movie is probably Baby Face with Barbara Stanwyck (and John Wayne in a tiny role).
There’s a William Powell movie, Jewel Robbery, with Kay Francis.
Powell robs a jewelry store at closing, and while his gang is cleaning the place out, he gives the customers and store people MJ cigarettes to smoke, impairing their ability to remember clearly what exactly happened and what the crooks looked like.