While I salute NORMLs efforts in their drive towards marijuana legalization, their info on drug testing often leaves alot to be desired.

There is no concrete evidence establishing that zinc has any effect on THC metabolites. Even when THC is being excreted via the stool, that will still not stop the kidneys from filtering THC metabolites from the bloodstream. As long as THC metabolites are present in the bloodstream, they will still end up being filtered by the kidneys and deposited into the bladder. And there is nothing that can be done to prevent the kidneys from performing their filteration duties. If the kidneys were unable to perform their filteration duties, that person would soon die - unless dialysis comes to the rescue.

Perhaps NORML should just stick to the drive towards legalization.