Saliva drug tests or so called oral fluid-based tests were specially created for detecting if a person has used any drugs for the duration of the prior some days. Nowadays saliva drug tests have really become widespread due to their handiness, inexpensive and the recent FDA approving. Thanks to their easiness these types of tests are often taken indoors on the job for accidental screenings and pre-employment, accidental, post-mishap, sensible mistrust, or come back-to-duty testing.
As for knowing the detection time, finding in saliva tests starts right away after use:
hashish and marijuana (THC) - 60 minutes after intake and up to twenty four hours depending on how the drug has been used;
crack and cocaine – starting with the moment it has been taken up to a couple of days;
opiates – can be detected beginning from the time they have been used up to 2 or 3 days;
ecstasy and methamphetamine such as ice, MDMA or crank - can be detected beginning from the time they have been used up to 2 or 3 days;
benzodiazepines can be as well detected beginning from the time they have been used up to 2 or 3 days.
So the best way out for a person who has recently taken any drugs is try to evade the test for the next 3 days.
When you are tested you will be asked to place the pad between the lower gums and cheek and quietly rub the pad back and forth along the gum stripe awaiting the pad is damp, you should try to counterfeit this movement and rub pad on teeth.