Diagnosis and treatment

In this July 9, 2019 photo, Dr. Jori Fleisher, neurologist, examines Thomas Doyle, 66, at the Rush University Medical Center in Chicago. Doyle, 66, hopes blood tests may someday replace the invasive diagnostic testing he endured to be diagnosed 4.5 years ago with Lewy body dementia. (AP Photo/Teresa Crawford)

In this Monday, July 8, 2019 photo, Troy Young, a hemp grower in North Salt Lake, stops for breakfast at a nearby coffee shop before returning to his indoor grow facility. Young, who recently applied for a medical marijuana growers license in Utah, lost his mother to an opioid addiction. If she had access to less destructive pain-relieving drug, like marijuana, Young said maybe she'd still be alive. (AP Photo/Morgan Smith)

Vice President Mike Pence walks past bales of seized cocaine during a visit to the U.S. Coast Guard Cutter Munro, Thursday, July 11, 2019, in Coronado, Calif. (AP Photo/Denis Poroy)

In this 2014 photo provided by the University of Mississippi, Dr. Suman Chandra inspects marijuana plants growing at the Ole Miss medicinal gardens in University, Miss. The plants are used for research under a contract from the National Institute on Drug Abuse. The planned NIDA grow for 2019 will be divided between high THC and high CBD varieties with “recent interest (in CBD) as a potential medicine for a number of medical conditions,” NIDA said. (Robert Jordan/University of Mississippi via AP)

President Donald Trump speaks about kidney health at the Ronald Reagan Building and International Trade Center, accompanied by Health and Human Services Secretary Alex Azar, left, Wednesday, July 10, 2019, in Washington. (AP Photo/Alex Brandon)

President Donald Trump kisses Hudson Nash, being held by father Andrew Nash, as Trump speaks about kidney health at the Ronald Reagan Building and International Trade Center, Wednesday, July 10, 2019, in Washington. (AP Photo/Alex Brandon)

FILE - In this Sept. 29, 2016 file photo, Spain's singer Julio Iglesias smiles during his star unveiling ceremony at the Walk of Fame in San Juan, Puerto Rico. A Spanish judge has ruled on Wednesday, July 10, 2019 that there exists sufficient evidence to determine that a 43-year-old Spanish man is the biological son of Julio Iglesias, despite the singer’s refusal to submit to genetic testing. The judge said the famous crooner’s refusal to have a DNA test, along with other evidence, is enough to rule in favor of the paternity suit brought by Javier Sanchez. (AP Photo/Carlos Giusti, File)

Dr. Nora Volkow, director of the National Institute on Drug Abuse, works in the MRI lab at the National Institutes of Health’s research hospital in Bethesda, Md., on Thursday May 16, 2019. Volkow is studying how anti-addiction medicines work inside the brains of people undergoing treatment for opioid abuse. In the background are NIH neuroimaging specialists Dana Feldman and Danielle Kroll. (AP Photo/Carolyn Kaster)

FILE - In this Oct. 25, 2018, file photo, President Donald Trump talks about drug prices during a visit to the Department of Health and Human Services in Washington. A federal judge Monday, July 8, 2019, blocked a major White House initiative on prescription drug costs, saying the Trump administration lacked the legal authority to require drugmakers to disclose their prices in TV ads. (AP Photo/Susan Walsh, File)

FILE - In this April 20, 2016, file photo, a man smokes a marijuana joint at a party celebrating weed in Seattle. Legalizing recreational marijuana for U.S. adults may have led to a slight decline in teen use. That’s according to research published Monday, July 8, 2019, in JAMA Pediatrics. (AP Photo/Elaine Thompson, File)