A recent study found that many online marijuana dispensaries sell to minors and ship across state lines where laws may be different.

The study, published by JAMA Pediatrics, found that out of the 80 dispensaries examined, nearly 1 in 5 didn't verify age, and more than 80% accepted nontraceable methods of payment.

One-third shipped across state lines, often times to states with laws different from where the marijuana was purchased.