okay now I have to write a page describing how we'll validate a cannabis use survey. this is not as easy as it sounds, what are we validating for instance? Use itself we can get from innactive THC in the blood, fine. But how do we sample that blood? How do we get folks to dose themselves and then get samples to us in a reasonable way? How about the other cannabinoids? is it sufficient to use urine or do we need blood? AAAAAAAAAAAAAARGH!