An Act amending Title 75 (Vehicles) of the Pennsylvania Consolidated Statutes, in driving after imbibing alcohol or utilizing drugs, further providing for definitions, for driving under influence of alcohol or controlled substance and for authorized use not a defense.

HB 878 amends Pennsylvania's DUI laws to clarify that using medical marijuana legally under the Medical Marijuana Act is not a defense for driving under the influence, except for commercial drivers. It directly affects medical marijuana patients who drive non-commercial vehicles by allowing their legal medical use to be raised as a defense in DUI cases. The bill adds "medical marijuana" to statutory definitions and modifies Section 3802(h) to explicitly state this use is a defense, while Section 3810 confirms authorized medical use isn't a defense unless specified in the new exception. This change does not alter DUI laws for alcohol or other controlled substances, only clarifies the medical marijuana exception. The bill takes effect 60 days after enactment.