" It doesn't apply to Oxycontin since Oxycontin is legal -- legal because it has recognized medical use in the U.S."
The US Government supplies Marijuana to some patients, and denies it to others. It recognizes the medical use for some, but not all.
Marijuana IS legal - to a very small set of people.
Oxycontin is legal - to a larger set of people.
No, it discontinued the study program -- those remaining on the program were grandfathered in and were to continue to report results.
"Marijuana IS legal - to a very small set of people."
Yes, of course it is. That "very small set of people" (a grand total of seven) represents the last of a failed (and discontinued) government study.