But things get much murkier when it is a task order for a defense customer issued against a civilian IDIQ. There are about a dozen protests pending at GAO right now that fall into that crossover category, where a defense agency used a GSA contract such as Alliant or OASIS to hire a contractor.
purified protein derivative (PPD). [pyoÌoÌâ²rifÄ«d]. a dried form of tuberculin used in testing for past or present infection with tubercle bacilli. This product is usually introduced into the skin during such tests and may produce a tuberculin reaction (wheal) within 48 to 72 hours.
Without getting into the chemistry of it, it means that the donor was exceptionally hydrated at the time of the test, and the urine â and everything it contains â was diluted. If itâs positive-dilute, there was still a sufficient amount of drug in the urine to produce a positive result, so itâs still a positive. If itâs negative-dilute, however, thatâs often a different story. A common way to pass a drug test is to consume mass quantities of water so that urine runs clear.