If a person wants to do that, nothing stops it now (anyone can pop a pill without anyone seeing them), however those medications normally have restrictions on them that the employee/boss work around. They likely would not be allowed on heavy equipment while using certain drugs. This bill, in the way it is written, actually prevents the boss from making restrictions in the minds of many legal folks, and I agree that the argument could be made. I believe the intent is to keep the boss or company from discriminating against someone using it, but because of the vague wording it could prevent any restrictions from being put on the worker.
So, if the same restrictions were on the prescribed Marijuana that were on other prescribed meds (narcotics) would you be more apt to legalize it?