A local reporter interviewed me about how DC's new medicinal marijuana law may affect workplace rules. Not much is the answer:
In other words, whether or not marijuana is legalized for medicinal purposes, if you come to work under the influence you can be fired (just like if you come to work under the influence of other legal substances, i.e., alcohol). Also, most states allow random drug testing and zero tolerance policies and possession of marijuana is still a federal offense. So, even if the use of marijuana does not affect your job performance, if your employer finds out you are using it, your employer can terminate you.