The best and easiest way to pass a drug test is by simply not taking the drugs you are being tested for. However, if your spirit is willing but your flesh is weak and so have succumbed to the call of the “dope,” do read the below ways to pass a drug test.
1. One way to pass a drug urine test is by diluting the actual sample. Basically, dilution is where drug metabolites or the concentration of the drug is reduced by adding fluid onto the urine sample. The most advisable liquid to add is warm water. Do note that certain facilities will place you in a bathroom with no sink and where water in the toilet is tinted in order to avoid the possibility of diluting the sample. When a sample is diluted, this lowers its creatinine level and specific gravity. Creatine is utilized by the muscles and its waste product is termed creatinine. Also, remember that specific drug testing labs routinely test samples taken in order to determine if dilution has occurred.
(NOTE: A lot of people mistakenly think that drinking a large amount of water is a form internal flushing or dilution which is equal to a negative drug test result. However, this is not true and even dangerous as some have died from water intoxication. Also, a urine that is colorless arouses a lot more suspicion causing drug testers to run a lower Confirmation sample of 15ng/mL instead of a 50 ng/mL – the standard test screen level.
2. Another way to pass a drug test via urine is by substituting the sample. This involves replacing your urine with the urine of another person or a synthetic sample.
(NOTE: Synthetic urine could be found in two forms: liquid (usually available in smoke shops and is similarly used to calibrate laboratory equipment) and powdered concentrate (which could then be added to warm water). Both these forms are kept inside a delivery devise with a temperature meter.
Substituting a sample using synthetic urine works on most employment urine tests only if certain conditions are met. These include being able to control the temperature (ideal temperature should approximately be anywhere from 92-100) as well as delivering the sample in less than 4 minutes.
You could also substitute another person’s urine, but you first need to test it with a reagent panel strip that is usually available in Wallgreens. It is highly advisable though to collect fresh urine and keeping it in a refrigerated sealed tight container. Also, it needs to be used within 48 hours.
(NOTE: This is necessary as urine has a tendency to darken and cause bacteria to grow. Fortunately, urine could be frozen for longer storage. Urine that has deteriorated will be noticed by the lab and interpreted as Urinary Tract Infection or UTI as stale urine is similar to ammonia and has a different pH.)

3. A drug test done through saliva or an oral fluid-based screening could easily detect drug use performed a few days before. Screening through such a method is actually more prevalent due to its convenience and inexpensiveness.

Marijuana and hashish is detected by a saliva test within 1 hour after taking it as well as within 24 hours (depending upon one’s use).

Meanwhile, cocaine could be detected within 2 to 3 days. Opiates, methamphetamine, benzodiazepines and ecstasy are detectable from the time it is ingested up to 2-3 days.

When asked for a saliva sample and you have been instructed to place the saliva collection pad between your gums and lower cheek – instructions usually require you to rub the collection pad back and forth along your gum line until it is moist – you can fake this action and instead rub the collection pad on your teeth.

NOTE: Never add bleach in order to make a sample null. Bleach will drastically alter the specimen and would be immediately flagged as tampered with causing you to fail on your drug test. Also, drinking bleach causes blindness and most likely death.