Marijuana use by the terminally ill vetoed

Pawlenty [Governor of Minnesota] indicated in a letter that he was torn by the medical marijuana legislation. He said that while he was "sympathetic to those dealing with end-of-life illnesses," he felt marijuana poses "serious public safety and health risks." Legalizing marijuana, even under limited conditions, "could serve to compound these problems," he wrote.

I am at a loss trying to understand how marijuana use by terminally ill people poses a risk to "public safety and health." This is the same medieval mindset that limits morphine use by people with bone metastases. If he fears that the material will "escape" from the deathbed to the community, he needs to get out into the real world; he's trying to close the barn door after the cow is loose.