Yeah I asked someone in human reliability about this not too long ago, she said even if it's made legal they are unlikely to change the restrictions any time so

Yeah I asked someone in human reliability about this not too long ago, she said even if it's made legal they are unlikely to change the restrictions any time soon. She said (and I'm not commenting on the validity of this line of reasoning myself, nor was she really) the argument is along the same lines of why you're also not supposed to be routinely getting wasted drinking -- it shows a pattern of unreliable behavior and there is also a risk of disclosing information when intoxicated. She did say that they might slightly relax the restrictions if weed was made fully legal.