From what I've been researching there is no controlled substance law that states having used marijuana violates the controlled substance act. On top of this for me to be answer yes to this question it would require me to know what controlled substance law I could have possibly violated. Plus if I was approved by Consolur Officer in London then that means there was no finding of violation of a controlled substance law, because if there was then I would be deemed inadmissable then and there on criminal grounds. So I should be able to answer no to this question, can anyone give more light on this? Or does what I have said sound correct