Any Lab test Now offers Saliva Drug Tests with following advantages:

Very difficult to adulterate

Saliva Drug Test best perform for water soluble drugs

Saliva Drug Testing is generally used to check if the person is under the influence at that very moment or was abusing substance within past several hours.

Saliva drug test samples can be collected anytime, anywhere and without the need for special collection facilities. Because each drug test collection can be directly observed, the risk of adulterated samples and chain of custody issues are virtually eliminated.

The Advantages: The most obvious advantage is the collection procedure is easier and less prone to possible efforts to beat the drug test by substituting various substances in the sample as is sometimes the case in urine drug testing. The ease at which a person’s saliva can be tested make saliva drug tests less invasive than other forms of drug testing and the saliva drug tests is easier and safer when compared to urine or blood. 

The Disadvantages:  The disadvantages mostly relate to the short drug detection time limitation of saliva drug tests. Most drugs do not linger in saliva and disappear quickly. Because of this saliva testing is being considered for drug detection in situations where recent drug use must be detected including vehicle and equipment drivers, those involved in workplace or other accidents and not as a use to detect past drug use.