 What's the impact of marijuana use on brain function and memory? InfoTrack's Roy Mackey is here with the story. Roy? Thank you, Chris. Our guest is Dr. Neil Dawson from the University of Lancaster in Lancaster, England. Dr. Dawson, you and your researchers were part of a study that examined possible implications for both those who use marijuana recreationally and those who use the drug to combat things like epilepsy, multiple sclerosis, and chronic pain. What is the big headline that came from your study?