Flushing is the excessive consumption of water to internally dilute the urine. It is often combined with the use of diuretics, such as herbal teas. it is by far the most common way to attempt to mask drug use. There are a number of products on the market today that aid in flushing. Most are herbal diuretic products which instruct the user to take them with large amounts of water – up to a gallon – on the day of the test. Commercial products include Clean-Free, SafeTest, Naturally Clean Herbal Tea, and Goldenseal. VistaFlow has two effective ways of checking for flushing, the urine creatine, and the specific gravity. A low creatine and low specific gravity indicate dilute urine, thereby alerting the collector of an invalid specimen.


Substitution of “clean” urine for one’s own is difficult when the urine collection is observed, however, some creative donors go to great lengths to cover-up their drug use. Lifelike prosthetics that dispense smuggled urine can be purchased. Some donors have even introduced another person’s urine into their own bladder by injection or catheterization. More commonly, when the collection is not observed, donors smuggle a hidden container of clean urine into the collection room. Checking the urine temperature immediately after collection indicates substitution when the counterfeit sample has not been brought to body temperature.

Addition of Adulterants

Adulteration is the secret addition of a masking substance to the urine. Additives work by either interfering with VistaFlow screen or by destroying the drugs present in the urine. Some of the most commonly used items are household products, such as bleach, liquid soap, salt, oven cleaner, and Visine. Others, marketed by anti-detection businesses, include potassium-nitrite (Klear), pyridinium-chlorochromate (UrineLuck), and glutaraldehyde (UrineAid).


Observed collection provides the first line of defense against specimen tampering. Additionally, our confirmation laboratory routinely tests each specimen for creatinine to identify diluted specimens. Lab specimens with a low creatinine level are further tested for specific gravity. When specimen adulteration is suspected on the basis of color, odor, or an EMIT screen alert, a more comprehensive battery of tests for adulterants is employed. This includes tests for oxidants, nitrites, glutaraldehyde, chromate, and surfactant (soap). As drug users expand their cover-up techniques, Intrinsic Interventions will continue to develop more sophisticated countermeasures.