I'll say first that I'm not too informed about Medicann and their policies. What I do know is if you just have your doctor's rec, then the company/agency you're attempting to work for should/would have no idea about your medical history. Now if you apply for the State ID card, your name is going to be put in the system and this MAY or MAY NOT affect you in any way. And this is more for the government's sake, rather than a potential employee.

But let's say you just got a county card, then no one's going to know except for them and them only. But like I said, I'm not too sure about Medicann's policies and whether or not they put your name in some kind of system. Honestly, though, I really wouldn't worry about it too much. Our current president used to snort coke, but hey, he's still the friggin' president of the United States.