When it comes to drug testing, benzalkonium chloride is found in many disinfectants and cleaners, such as Sagrotan. However, benzalkonium chloride does not affect the detection of THC-COOH by GC-MS. According to a scientific study, the addition of Papain can reduce the concentration of THC-COOH in the urine without being easily identifiable in the laboratory. A commercial product, Urine Luck contains PCC (Pyridinium Chlorochromate) as the active ingredient reduces the concentration even better that it can act longer.
The concentration of THC in the blood cannot be changed. However, it is important to note that these blood tests are inaccurate. The study of eye drops gave a negative result in tests with sweat. A product is available on the internet to falsify salivary tests but the effectiveness has not been studied. The concentration of THC in saliva is due to the inhalation of smoke. It is likely that a serious mouth rinse may decrease this concentration.
However, there is usually no time to handle drug testing in sweat or saliva. Careful washing of hair with some shampoos can reduce THC and its metabolites. In one study the use of Head & Shoulders, Neutrogéna or Rave gives rise to a reduction in drug concentration. Based on theoretical considerations, it is likely that discoloration of the hair with hydrogen peroxide, a powerful oxidant, reduces the concentration of THC in the hair.
Regarding hair tests, it is good to know that in the absence of hair, axillary and pubic hair can be used in the screenings. The test result is possibly dependent on the choice of Immunoassay. The only substance that can not be easily detected is eye drops. It is the preservative contained in eye drops, benzalkonium chloride, which is active in this case. Some drops are enough to prevent finding THC-COOH in the urine, by means of Immunoassay.
Only when a job is associated with a high-security risk can a company require employees to take preventive drug testing. However, this procedure must be regulated in the employment contract and the tests may only be carried out by medical specialists (for example, a medical examiner, personal medical service).
Given the problematic alcohol consumption of a worker, the employer has a great responsibility. The consumption of alcohol and other drugs that threaten to impair job performance should not be tolerated in a professional environment. Because of their intoxicating effect, they are incompatible with the quality and safety requirements of the workplace.
For this reason, some companies are considering the introduction of drug tests (urine samples, alcohol tests). Addiction does not agree with such practices, which constitute a violation of privacy and are detrimental to the relationship of trust required for dialogue. All the more so as there are other, less drastic and professional measures to intervene in cases of suspected alcohol or drug use.