Reefer Madness was originally a propaganda film from the 1930s that tried to paint marijuana usage as the source of all sin and evil in a ridiculous, over-the-top manner. While initially unsuccessful, the film gained notoriety in the 1970s as a comedy, even though that was never the originally intended purpose. The film then spawned a Broadway musical and a film based on the musical, both of which are quite hilarious.
L.A. Noire's Reefer Madness puts you back on the Vice Desk, partnering with the sleezy Roy Earle to bust a drug distribution ring in which marijuana is being sold in sealed vegetable soup cans. It begins (as these cases often do) with a murder which invariably leads you to a string of suspects and to eventually busting the ring. Reefer Madness offers all the same gameplay elements seen in the rest of L.A. Noire: interrogation, investigation, driving, chasing, and shooting. Unsurprisingly, nothing new is added to the gameplay with Reefer Madness.
Unlike Nicholson Electroplating, Reefer Madness doesn't bring anything spectacular or dramatically different to the presentation of L.A. Noire. A car dealership, a soup canning factory, and a couple of new residences aren't exactly brilliant set pieces like the Spruce Goose was. What is there is just as high quality as you'd expect from L.A. Noire, with the same top notch acting, facial capture, sound, design, and execution. There just aren't any "wow" moments that make it significantly different from what's already present on the game disc.
Reefer Madness is a good, realistic, and believable Vice Desk case, but it doesn't offer anything that wasn't seen in the main L.A. Noire Vice Desk to begin with. Just like Nicholson Electroplating, Reefer Madness costs $3.99 or 320 Microsoft Points and takes 2-3 hours to complete. Unlike Nicholson Electroplating, which offered some unique set pieces and experiences to differentiate it from the rest of L.A. Noire, Reefer Madness doesn't offer anything that wasn't in the rest of L.A. Noire that came on the disc.