Summary: On today’s Gist, why the YouTube shooter’s use of a handgun doesn’t take anything away from arguments to outlaw the AR-15.<br>Plus, <a href="https://twitter.com/radleybalko">Radley Balko</a> tells the story of two men who put innocent Mississippians behind bars using junk science and pseudo-expert testimony. Balko is the co-author, along with Tucker Carrington, of <a href="http://www.amazon.com/dp/161039691X/?tag=slatmaga-20"><em>The Cadaver King and the Country Dentist: A True Story of Injustice in the American South</em></a>.<br>In the Spiel, why the <em>Roseanne</em> reboot isn’t harmful pop culture.
