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Urinalysis Drug Tests
Urinalysis Drug Tests
Testing is most frequently performed on small samples of urine, although hair, saliva, and blood can also be used. Urine samples are collected by personnel under carefully controlled circumstances to avoid mismatches resulting in false positives, and to prevent adulteration of the specimen by the swapping of samples or the addition of foreign substances. In particular, urine samples heavily diluted with water can skewer results, and so highly diluted specimens are routinely rejected. In certain legal cases involving individuals known to be repeat drug offenders, personnel are usually required to witness the sample being provided in order to ensure that no adulteration has taken place. Samples can be tested at the same site in which they were provided. More frequently, it is shipped to a large facility that specializes in mass-testing specimens. Care must be taken in shipping to ensure the integrity of the specimen, and those that indicate contamination are not processed. A special tamper-proof seal is routinely placed on bottles to indicate whether or not this has occurred http://www.getgift.com.cn/Drug-Testing.htm |
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