UnityPoint Health - Des Moines and Drake University will host a public forumon youth mental health and substance abuse at Sept. 3 at 7 p.m. in Meredith Hall, Room 106, on the Drake campus. UnityPoint spokeswoman Amy Varcoe said the forum is timely, given confusion over what constitutes medical marijuana in Iowa and how it differs from legalized marijuana in Colorado. For more information, call 515-263-4004.