you could maybe pass if you rarely smoke, the test is less sensitive, and you also have low body fat (skinny does not automatically mean you have low body fat). certo would only maybe mask thc in your urine for 4-6 hours. it’s “supposed” to form a gel in ur digestive system that “traps” thc metabolites, which means it’ll get excreted in ur poop instead did you last smoke 3 days ago?