In order to qualify, Pennsylvania physicians had to write recommendations, known as "Safe Harbor Letters," to authorize families of pediatric patients to import cannabis products from other states until production starts in Pennsylvania. Levine pointed out that 282 "Safe Harbor" letters have already been issued by the health department. Pennsylvania physicians had to write recommendations allowing the families of pediatric patients to import cannabis products from other states until production starts in Pennsylvania. But, those "Safe Harbor" doctors didn't need to join a registry or take any special classes.