Steve McWilliams Truth in Trials Act

Steve McWilliams Truth in Trials Act - Amends the Controlled Substances Act to establish as an affirmative defense for any person facing prosecution or a proceeding for any marijuana-related offense that the marijuana-related activities in question were in compliance with state law regarding the medical use of marijuana. Allows a finder of fact to find a defendant guilty of a lesser offense if the defendant's marijuana-related activity was found to be primarily, but not exclusively, for medical purposes. Provides for the return of any property with respect to which an individual successfully makes a defense under this Act.

Amends provisions concerning the seizure and custody of marijuana to limit seizure authority of marijuana authorized for medical use and provide for the retention of seized plants pending resolution of a case involving an affirmative defense for the medical use of marijuana.