THC is not water soluable. Therefore, how does the THC get lost in the water? I mean if you are putting some milk or booze in your bong, yeah, I suppose so...

Thats why drinking bong water doesnt do much but make you sick and look like an ass.

There have been plenty of studies in the history of science that have been fundamental flawed or just plain wrong. Just because its from NORML doesnt mean they are immune to being wrong.