During his 25 years of researching cannabis, Dr. Daniele Piomelli has received hundreds of emails from people desperately wanting to know whether the plant can help them with medical problems. He recalls the one he received from the father of a girl with autism who was desperate for help.
“Ninety-nine percent of the time, I have to say, ‘We just don’t know,’ ” said Piomelli, a professor at the University of California, Irvine. “It’s heartbreaking.”
