The NIH, specifically the National Institute on Drug Abuse (NIDA), awarded Dr. Nicole Ennis and Dr. Sherrilene Classen (Co-PIs) with a R-21 (1 R21 DA048067-01A1) to study Medical Marijuana Use and Driving Performance: A Test of Psychomotor Functioning in Adults 50 and Older from 09/15/2020 – 09/14/2022. The goal of this study is to assess the effect of medical marijuana on response time, attention, and executive functions in older adults 50 years and older.