Eugene Bell Foundation Chairman Stephen Linton speaks during a news conference in Seoul, South Korea, Friday, Nov. 16, 2018. The U.S.-based nonprofit group called for South Korea to take stronger steps to fight a tuberculosis crisis in North Korea it says has worsened under strengthened U.S.-led sanctions over its nuclear weapons and missile program. (AP Photo/Lee Jin-man)

In this Monday, April 21, 2008 file photo, a U.S soldier looks through the scope of his weapon during a night patrol in Mandozai, in Khost province, Afghanistan, seen through night vision equipment. About 400,000 veterans had a PTSD diagnosis in 2013, according to the Veterans Affairs health system. (AP Photo/Rafiq Maqbool)

In this Tuesday, Nov. 13, 2018, photo provided by RCH Melbourne Creative Studio, 15-month-old girls, Nima and Dawa lie in their hospital bed following a successful separation surgery last week. The conjoined twins from Bhutan were separated at an Australian hospital on Nov. 9, 2018 in a delicate operation that divided their shared liver and reconstructed their abdomens.( The Royal Children's Hospital Melbourne Creative Studio via AP)

FILE - In this June 26, 2018 file photo, Health and Human Services Secretary Alex Azar speaks during a Senate Finance Committee hearing on Capitol Hill in Washington. The Trump administration is opening the door for states to provide more inpatient treatment for people with serious mental illness by tapping their Medicaid programs. Health and Human Services Secretary Alex Azar made the announcement Tuesday. (AP Photo/Jacquelyn Martin)

Second lady of the United States Karen Pence speaks during an interview with the Associated Press at the residence of U.S ambassador to Japan in Tokyo, Tuesday, Nov. 13, 2018. (AP Photo/Koji Sasahara)

"We did it!" yells Shawn McDonald, center, as he celebrates with Teisha Martinez, left, and Aubrey Taylor after a local media outlet called results showing Proposition 2 passed at the Proposition 2 election night party at the Infinity Event Center in Salt Lake City, Utah, on Tuesday, Nov. 6, 2018. Proposition 2 legalizes the medical use of marijuana for individuals with qualifying medical illnesses. (Kristin Murphy/The Deseret News via AP)

FILE - In this Sept. 25, 2018, file photo, a police officer shows buds of marijuana before a news conference Bangkok, Thailand. The National Legislative Assembly on Friday, Nov. 9, 2018, submitted amendments that would put marijuana and the plant kratom, popular locally as a stimulant and painkiller, into a legal category that would allow for their licensed possession and distribution under regulated conditions. (AP Photo/Sakchai Lalit, File)

FILE - In this Jan. 21, 2018 file photo, yoga enthusiasts take part in the Pittsburgh Yoga Expo, at the Pittsburgh Opera building in Pittsburgh. A new report says more Americans are doing yoga and meditation - including kids. A government survey last year found 14 percent of adults said they had recently done yoga, and the same percentage had recently done meditation. That’s up from 9.5 percent and 4 percent from a similar survey that was conducted five years earlier. For kids ages 4 through 17, the latest survey found 8 percent had recent done yoga, up from 3 percent. About 6 percent did meditation, which was similar to the earlier survey. (Matt Freed /Pittsburgh Post-Gazette via AP, File)

In this Friday, Oct. 26, 2018, photo Brad Lander, a clinical psychologist in the department of addiction medicine at Ohio State University Wexner Medical Center, explains his skepticism about the use of medical marijuana to fight opioid addiction in Columbus, Ohio. Lander says marijuana impairs judgment, motor control, memory and is linked to amotivational syndrome, which results in apathy and a decreased interest in activities. (AP Photo/Andrew Welsh-Huggins)

FILE - In this June 17, 2015, file photo, marijuana plants grow at LifeLine Labs in Cottage Grove, Minn. Backers of legalizing marijuana in North Dakota have high hopes voters will approve the drug just two years after they said yes to medicinal use. But they may be in for a bummer, since deep-pocketed outside groups so far haven't put a dime into the measure, suggesting they don't see it as a good bet. Meanwhile, opposition groups have spent heavily to publicize their concerns that approval would mean big societal problems. (AP Photo/Jim Mone, File)