The major flaw with this test is that it cannot determine whether any drug residue found was left by the child under suspicion or by someone else.īlood tests are the most accurate test but are not used routinely in the workplace or school.Ī saliva test is a way to detect if someone has been using drugs within the past few days. The pad then is mailed to the manufacturer for testing. The kit comes with a pad that picks up drug residue by swiping the pad on the child’s belongings. Residue tests are typically found in home testing kits that allow parents to test their children. To prevent tampering, the adhesive plastic film cannot be reapplied once removed. Contaminants from the environment cannot penetrate the adhesive barrier from the outside, so the patch can be worn during normal activities. To test sweat, a bandage-like patch is placed on the upper arm, midriff, or lower back to collect sweat. Hair testing has an advantage because it can detect drug use over longer periods of time (usually around 90 days). However, products used on the hair might, at times, interfere with test accuracy. This is in contrast to drugs in smoke, which stick to the hair and can be removed with shampoo. Typically, drugs cannot be washed out of the hair. If the drug was taken in the past, the drug will be found in hair that has grown out. Therefore, if the drug was taken recently, it will be found in the hair near the scalp. Drugs circulating throughout the body cling to the hair as it grows. Hair provides a semi-permanent record of drug use. Hair tests are less susceptible to adulteration than urine tests. This test is highly specific and is typically used when testing for the presence of a specific drug is needed. For more precise results, the confirmatory urine drug test is done by gas chromatography/mass spectrometry or high-performance liquid chromatography. Thus, a substance may be present, but if the concentration of that drug is below the cutoff, the result will be negative. Typically, the screening immunoassay detects the amount of drug present in urine above a predetermined cutoff concentration. It usually tests for marijuana, cocaine, opiates, PCP, and amphetamines. In the majority of situations, a screening test is used that utilizes an immunoassay, which detects the parent drug and/or metabolite. Urine drug testing is widely used for testing for opioids and illicit drugs. The ability of the test to detect these substances depends on how much was used and for how long. Anabolic steroids can also be detected through urine testing. A component of marijuana called THC can be detected in the urine. Urine testing is the most popular type of test because it is simple, non-invasive, and highly accurate.
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