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However , even though these tests used only the remaining portions of the hair samples , GC / MS detected cocaine in all nine specimens , indicating RlAH 's potential to identify individuals who may be drug users but who probably have not taken drugs within a day or two of a urine test . It may also result from other types of substances , such as thimerosal used as a preservative in some eyewashes and eye drops , or from chemicals found in cosmetics and hair spray . Shower first and brush hair and teeth later . As scientists adopt a systems approach to studying biomolecular processes , the nanobiosenso — a tiny fiber-optic probe with a tip 1,000 times smaller than a human hair — provides a valuable tool for intracellular studies that have applications ranging from medicine to national security to energy production . All have fangs , bulging eyes and scary hair and are illuminated by torches.The procession is usually organised by the Seka Teruna , the youth organisation of Banjar .