As medical marijuana has become legal in much of the U.S., more senior citizens are starting to use it to manage pain and opioid addiction. In Arizona, one retired police officer overcame his own personal biases to become a medical cannabis coach. He now teaches some of the state's elderly population how to use medical marijuana for the first time. Arizona Public Media's Andrew Brown reports. Stream your PBS favorites with the PBS app: to.pbs.org/2Jb8twG Find more from PBS NewsHour at www.pbs.org/newshour Subscribe to our YouTube channel: bit.ly/2HfsCD6 Follow us: Facebook: www.pbs.org/newshour Twitter: www.twitter.com/newshour Instagram: www.instagram.com/newshour Snapchat: @pbsnews Subscribe: PBS NewsHour podcasts: www.pbs.org/newshour/podcasts Newsletters: www.pbs.org/newshour/subscribe