I think the world of technology is such that you could have a program that tests how quickly people respond to stimulus, how quickly they...just by hitting a computer screen. How long does it take you to hit the button after something flashes yellow? If you're impaired with marijuana, is there a delayed reaction? Then you're talking about real impairment, not just levels of substance in the bloodstream.
On September 25th, 2017. See this statement in context.