We also know that drugs vary greatly in the time that they remain detectable in a person's system. Cannabis, for instance, can be detected weeks after use and long after any impairment or long after any impairment that involves consideration of workplace performance has worn off. Actually, if the member who's sponsoring this bill wanted to improve health and safety at work, as he's claimed quite vigorously from his seat, then this bill wouldn't actually be the vehicle for it.