Cannatest July 12, 2014 on Featured, Testing & Lab Services by Caroline Cahill Cannatest July 12, 2014 on Featured, Testing & Lab Services by Caroline Cahill Cannatest is a Seattle-based laboratory that provides potency testing for THC, THCA, CBD, CBDA, CBG, CBC and THCV, and safety screening for mold and mildew on cannabis and cannabis-related products by using thin layer chromatography.