Experts don’t know how long the synthetic cannabinoids in K2 stay in your system. But some can be detected within 72 hours of use. More on the metabolism of K2 ingredients here.
marijuana drug testing
No, synthetic weed does not show up on drug tests because it does not produce the metabolite in urine that is used to test for cannabis use. But soon a new test may be developed. More on sythetic marijuana drug testing here.
The half life of THC depends on potency, frequency of use and mode of administration. But generally, the THC found in marijuana can stay in the body for days or weeks after use. More on how long THC stays in the system here.