1. Know your rights. Know detection periods for the drugs you are using. For example, alcohol is detectable for 12-24 hours after consumption using a standard EMIT drug test, and can be detected up to five days after usage with an ethyl gluconuride urine test. Cannabis (marijuana) can stay in the system anywhere between 2-3 days to 12 weeks (with 2 weeks being the norm), depending on frequency of use. Methamphetamines are reputed to have a detection period somewhere between 3 and 5 days. Try to take the test as late as possible.
2. Drink plenty of water before the test. This will dilute the urine, making it difficult for the testing service to get reliable results. They might want you to provide them with a new sample, by which time, detectable quantities of the substances might have passed out of the system. You may also go to a store such as GNC, they have drinks there filled with B vitamins, you must also drink about a gallon of water to make sure. This is a definite pass. Beware though, a diluted urine sample is rather like a red flag. They may request another sample but it is possible that as opposed to a simple urine sample they may require a hair or blood sample. This may particularly be the case if you are involved in some type of court ordered drug testing program.
3. Create false positives by taking over the counter medication, e.g Tylenol. This, like in step 2, will interfere with the ability of the testing service to provide accurate results. Do not take more than the recommended daily allowance of Tylenol. This can have very serious effects on your liver and can be fatal, even if you don't feel ill, or notice any symptoms.
4. If you have been doing opiates, tell them you had a poppy seed bagel or two. This can create a false positive for opiates. (Do not actually eat poppy seed bagels)
1. Drink lots (2 gallons) of cranberry juice if you have been doing cocaine and you can get it out of your system in a day.
5. Substitute your urine for some synthetic urine (e.g. Quick Fix or Ultra Pure) and make sure it is the recommended temperature range of 94°-100°F