hmmm, if given a drug test you're going to light it up anyway due to the opiod pain killers, and since they couldn't/can't fire you over those, they wouldn't be able to fire you over a legally obtained prescription drug. As a former employer, that's not a can of worms I'd want to open...especially in a liberal, employee biased state like Oregon where the labor laws really are in such favor of the employee. That's a lawsuit your employer would never win...especially in that state, so I wouldn't fear an imbecile like that one bit, in fact I'd tell him to "f" right off and keep his ideals out of your cancer treatment...but that's just me.

Good luck Mark