In Washington State not to long ago, a transplant patient was denied an organ and subsequently died for marijuana
use; this in a state that permits medical
use of the herb. The TP center had it’s own protocol, regardless of state law. Fair? Who knows; at that point, does it matter much?
http://www.komonews.com/news/18475224.html
Good luck— personally, I’d take my chances and treat without the grass, myself— seems like a small price to pay for keeping a liver.