Toronto Blue Jays center fielder Colby Rasmus fields the ball after Pittsburgh Pirates' Tony Sanchez singled in the second inning of the baseball game on Friday, May 2, 2014, in Pittsburgh. (AP Photo/Keith Srakocic)
Rep. Carly Melin speaks at a press conference on Thursday, May 1, 2014, where House DFL backers of getting medical marijuana to critically ill children and adults announced that they had reached a compromise. The deal, announced by House Speaker Paul Thissen, Majority Leader Erin Murphy and Rep. Carly Melin, would create clinical trials of medical marijuana for the severely ill. If the medical researchers cannot obtain marijuana for the trial -- and they may not be able to because marijuana is a federally illegal substance -- the proposal would include "the option of a state-based manufacture of medication" for the trial. (AP Photo/The Star Tribune,Matt Gilmer)
This undated handout photo provided by the University of Pittsburgh Medical Center shows Dr. Stephen Badylak, a surgery professor at the university, and deputy director of the McGowan Institute for Regenerative Medicine, holding a sheet of “extracellular matrix,” scaffolding-like material derived from pig bladder. His team implanted a similar version, designed for use in humans, into a handful of men with severe leg injuries and reported Wednesday that the experimental treatment helped regrow muscle. (AP Photo/University of Pittsburgh Medical Center.
This photo provided by the Tarrant County Sheriff’s Office shows Fort Worth, Texas veterinarian Dr. Millard Tierce. Tierce has been arrested on an animal cruelty charge after a former client alleged her dog was kept alive and used for blood transfusions after she was told it had been euthanized. (AP Photo/Tarrant County Sheriff’s Office)
ADVANCED FOR USE SUNDAY MAY 4 AND THEREAFTER IU Health surgeon Emma Rossi, left, injects a glow-in-the-dark dye during a new procedure for uterine cancer surgery at IU Health Simon Cancer Center, Tuesday, April 1, 2014. Glow-in-the-dark dye is used to find out which lymph nodes need to be removed. (AP Photo/The Indianapolis Star, Kelly Wilkinson)