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.

Plus, Radley Balko 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 The Cadaver King and the Country Dentist: A True Story of Injustice in the American South.

In the Spiel, why the Roseanne reboot isn't harmful pop culture.

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