Recently, the star of the news of drug abuse, artist Ke Zhendong detained in Beijing for drug use, and accept the "Taipei Prosecutor 's Office" summoned to appear in court, in addition to collecting urine also forensic forensic scissors 8 pinch body "hair"

So, hair test is how is it? Can it detect if a person has been poisoned?

Long-term retention of toxins in the hair

From the hair laboratory can get a lot of information.

Even if only a bunch of pencil thickness of hair, chemists can also be seen from the test results which a person has taken specific drugs and about when to take these drugs. Eating psychedelic drugs such as cocaine, methamphetamine (a stimulant), ecstasy and pentachlorophenol, their toxins enter the bloodstream, remain in the hair follicle, and then spread to each hair. These toxins in urine and blood may only stay for about a week, but in the hair but can long-term retention. In general, the hair grows about 1.25 cm per month, which projections, a woman with long shoulder-length hair will carry about two years of medication records. When testing, scientists will first cut a length of about 3 months of hair growth, and then cut them into small pieces, and then carry out specific analysis. In fact, in the early 1990s, through research into the hair of Peruvian and Chilean mummies, scientists discovered that the history of human smoking cocaine dates back to 1000 BC.

Hair is the first choice for scientists to test

Drug testing can choose any part of the body hair - armpits, legs, back, pudendal, but because the length of hair than other parts of the long, relatively clean, so the scientists preferred test object. Although pussy hairs are long enough to store information for months, they are more likely to be contaminated with sweat and urine, making them less reliable. In addition, the test results will be affected by the color and texture of the hair. Studies have shown that darker hairs are more likely to absorb drug residues than light-colored hairs.