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1. Drinking a large quantity of fluids before a urine drug test will flush your system, making it difficult to detect drug use.

Answer:  Ingesting a large amount of water prior to taking a urine drug test may cause you to have a diluted specimen, but will not result in a negative result. A diluted specimen may raise questions from your employer. Be prepared, as you may be required to retest.

2. Exposure to second hand smoke may cause you to test positive for marijuana.

Answer: This is a BIG NO. Being trapped in a Prius with five people all smoking marijuana is highly unlikely for you to test positive. Exposure at this level is highly unlikely to reach the cutoff of 50 nanograms of THC metabolites per milliliter, the most commonly used cutoff level.

3. If you quit smoking marijuana, you will test negative within thirty days.

Answer: This is not necessarily true, as there are numerous factors that play a role. Some of the variables include, but are not limited to, the frequency of use, quality of the product, method of use, metabolism, body fat and body chemistry. Chronic users have been known to test positive up to two months following cessation. The reality is that there is no hard and fast rule on the timeframe for flushing marijuana from one’s system.

4. Adding adulterants ‘cleans’ your urine of all drug use.

Answer: Laboratories today have the ability to test for many adulterants commonly used to mask drug use. Using adulterants is a risk you take, as these substances will change the pH levels in the urine. Laboratories are constantly updating testing methods as new adulterants enter the market.

5. Dog urine can be substituted to pass a drug test.

Answer: Laboratories will immediately flag the specimen as unacceptable. Please leave Fido alone.