Doing so will ensure that you will produce enough. It takes some knowledge and tricks however, making sure such a decision doesnt affect ones career, and thats where knowing how to pass THC drug tests comes in handy. Multi Level THC Test Kit Level check THC in Your Body. A negative result for any single drug is the presence of a reddish-purple line in both the test and control areas? var links=w.document.getElementsByTagName("link");for(var i=0;i