This^. I would lose my clearance and career if I did MJ and yes they still test piss, hair and fat cells to check for various drugs periodically.
Many industries still require drug testing even if the state has "legalized" it.
When Illinois legalized it, they said the state police would not be going after people that used it and owned guns.
However, there have been a couple of people who failed their background check to purchase guns, because they had a medical marijuana card. Here in Illinois, they scan your driver's license/ID if you buy pot. Yeah, I like my guns and I have never smoked pot.