Democratic presidential candidate Hillary Clinton responds to a question from Roland Martin, host of TV One's News One Now, during a town hall meeting at Claflin University in Orangeburg, S.C., Richard Burkhart/AP Images for TV One hide caption

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Ohio's proposal to legalize recreational and medical marijuana is being met with opposition from residents who generally support legalizing pot. iStockphoto hide caption

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Fears Of Marijuana 'Monopoly' In Ohio Undercut Support For Legalization

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When Weed Is The Cure: A Doctor's Case for Medical Marijuana

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Marijuana at a medical marijuana dispensary in Los Angeles. Twenty-three states and the District of Columbia have legalized medical marijuana. David McNew/Getty Images hide caption

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Using chemicals to control bugs or mold is common among commercial cannabis growers. But with no federal oversight, experts are concerned growers may be using dangerous pesticides. Ted S. Warren/AP hide caption

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Concern Grows Over Unregulated Pesticide Use Among Marijuana Growers

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A marijuana bud displayed in Denver. Don't legalize pot, the pediatricians say, but don't lock teenagers up for using it, either. Seth McConnell/The Denver Post/Getty Images hide caption

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Workplace drug testing for marijuana may need updating in light of changing laws, a case before the Colorado Supreme Court suggests. Kai-Huei Yau/MCT/Landov hide caption

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Colorado Case Puts Workplace Drug Policies To The Test

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Robert Calkin, the president of the Cannabis Career Institute, spoke at an exhibition called Hempcon held in San Bernardino, Calif., last year Courtesy of Robert Calkin/AP hide caption

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One of three marijuana plants growing in the backyard of a 65-year-old retiree from Pompano Beach, Fla. He grows and smokes his own "happy grass" to alleviate pain. Carline Jean/MCT/Landov hide caption

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Entrepreneurs Buzzing Over Medical Marijuana In Florida

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Marijuana grown for medical purposes is shown inside a greenhouse at a farm in Potter Valley, Calif. Eric Risberg/AP hide caption

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Rep. Andy Harris: Like chewing on mold

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Vaporizer pens look like the e-cigarettes that dispense nicotine. But these devices are optimized for a potent marijuana resin with high concentrations of THC. Courtesy of Grenco Science hide caption

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Pot Smoke And Mirrors: Vaporizer Pens Hide Marijuana Use

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C. Nash smokes after possession of marijuana became legal in Washington state on Dec. 6, 2012. Ted S. Warren/AP hide caption

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Evidence On Marijuana's Health Effects Is Hazy At Best

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Marilyn Budzynski takes care of her 20-year-old son, Michael, in Eustis, Fla., in September. Michael suffers from Dravet syndrome, a severe form of epilepsy. Tom Benitez/MCT /Landov hide caption

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Florida Bill Would Allow Medical Marijuana For Child Seizures

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There's data to support the notion that pot, or a drug based on its active ingredient, could help ease the fears of PTSD. Ted S. Warren/AP hide caption

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Could Pot Help Veterans With PTSD? Brain Scientists Say Maybe

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A new free market for medical marijuana in Canada will replace small growers with large-scale indoor farms. Menahem Kahana/AFP/Getty Images hide caption

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