![](https://cannabis.net/drive/1000/3743_0A4z_whatisthc-cooh.jpg?width=200&height=200)
Most avid cannabis users are quite familiar with the popular cannabinoid called tetrahydrocannabinol (THC) but many of them are not familiar with its counterpart THC-COOH. Quite surprisingly, it is this unpopular THC metabolite that is tested for whenever a drug test, most especially workplace testing is conducted for cannabis users. And the reason for this is simply because it lasts longer than THC in the human body.