The plant marijuana has a psychoactive effect caused by the delta-9 Tetrahydrocannabinol or THC within the plant's chemical makeup. This is the mind-altering catalyst that brings about the euphoric state that appears from ingesting it in any manner. A saliva test can detect the presence of this chemical in the human body. Mainly because THC attaches to the fatty tissues once it enters the bloodstream in addition to the receptors in the brain that cause the euphoric state brought on by smoking, ...