Untangling Missouri's Competing Medical Marijuana Initiatives Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email In this July 12, 2018 file photo, head grower Mark Vlahos tends to cannabis plants at Sira Naturals medical marijuana cultivation facility, in Milford, Mass. ( AP Photo ) Produced by Kate Gwon Allison and Isabel Angell Hosted by Tanzina Vega Produced by PRI and WNYC