What Drug Testing Methods Exist
There is a variety of drug testing methods that are effectively utilized nowadays, and the most common, fast and inexpensive among them are the dip strip urine tests based on EMIT assay . http://rowantedge.tumblr.com/ Such drug tests apparently use human urine as a sample to determine the fact of presence or absence of metabolites, and sometimes quantitative measure of illicit drugs found in the tested person’s system. Urine screening is reliable, easy to apply and very convenient not to mention the fact that it is recommended by laboratories as less invasive comparing to the majority of the drug testing methods, which employ other substances from human body as a specimen.
Another widely accepted method to test for prohibited substances is a hair follicle analysis, in which a fragment of hair strand is taken from the patient’s head, hand or even leg and further testing is performed in the laboratory using special sophisticated equipment. This procedure is usually not fast and may take approximately 4-5 days or so to receive the final result, but using this method may reveal the traces of previous drug use and can detect it even 6 months later, while showing all the specific substances used.
The next method to review is saliva analysis, also called oral or mouth swab test, which is not very common but is widely used in federal organisations, forensic affairs and sensitive cases. Schools and offices infrequently apply this method inasmuch as it is considered impractical and capable to detect exclusively the recent drug intake, which happened in the last few hours. On the other hand saliva tests are more expensive and therefore less common, but considered reliable, easy and non-invasive technique, as sample is collected by sterile cotton mouth swab while an individual is under observation, what makes it almost unrealizable to alter the results. This method focuses on the current intake of toxic substances rather than the long-term use because drug residues and metabolites in saliva have shorter half-life and output time as compared to urine and other body fluids.
The most efficient and accurate method of drug testing is through blood analysis, however this method is very expensive and invasive and is not allowed by the federal government apart from insurance requests because of juridical claims. Since blood analysis gives more thorough and specific results, oftentimes this kind of screening is conducted to determine the current overall health issues, but occasionally it is also used for specific professional detection of the exact dosage and level of contamination. Unlike the dip strip tests for urine analysis, which can be utilized by everybody and detect the presence of metabolites only at the level above cut-off, blood testing kits can be applied exclusively by trained medical professionals to reveal and accurately measure the actual toxic substance in the human body at the specified point of time and is frequently used to determine whether or not the person was under the influence of psychoactive substances during accidents.
Notwithstanding, whichever testing technique to be applied - urine, blood, hair or saliva, there is always an effortless and legitimate possibility to pass a drug test successfully for those who take illicit substances occasionally, because federal guidelines set limitations also known as cut-off levels for all drug traces. If laboratory detects the presence of drug in biological specimen during testing, but it has not reached the statutory cut-off, then it is still considered a negative result, which does not require confirmation and has no consequences.