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Terahertz Scanners See Inside Sealed Packages

Posted by michael on from the naughty-bits dept.

opticsorg writes "Japanese scientists have demonstrated a system that detects the presence of illicit drugs that are concealed within an envelope. Tests to date have shown that the imaging system can successfully detect and identify a range of substances including ecstasy (MDMA) and methamphetamine. The researchers are now working with companies to develop a mail screening system that could suit use in post offices and airports."

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  1. Marijuana Does Not Cause Reckless Driving by bleaked · · Score: 5, Informative

    Marijuana Does Not Cause Reckless Driving
    Date: Tue, 30 Sep 2003 08:04:40 -0700
    Subject: Marijuana Does Not Cause Reckless Driving
    Pubdate: Fri, 26 Sep 2003
    Source: DrugSense Weekly
    Section: Feature Article
    Website: http://www.drugsense.org/current.htm
    Author: Mitch Earleywine, Ph.D.
    Note: Mitch Earleywine, Ph.D., is an associate professor of psychology at the University of Southern California and author of "Understanding Marijuana" (Oxford University Press, 2002).

    MARIJUANA DOES NOT CAUSE RECKLESS DRIVING

    The White House Office of National Drug Control Policy (ONDCP) and certain Wisconsin legislators have launched a new crusade against "drugged driving," with a heavy emphasis on marijuana. This crusade is largely based on scientific misinformation, and it could lead to the enactment of bad laws.

    ONDCP has several slick television commercials on the subject. One shows dramatic auto accidents and two crash test dummies passing a joint while a serious voice says, "In a recent study, one in three reckless drivers tested positive for marijuana." Note the careful phrasing. The idea is to make viewers think that marijuana caused the reckless driving, without really saying that it did.

    Why would ONDCP be so coy? The answer lies in the actual data regarding marijuana's effects on driving,

    I study the effects of drugs and teach classes in the science of illicit substances, so I know this field. The plain fact is that marijuana does not cause reckless driving. Large studies of accidents show that drivers who test positive for marijuana (and ONLY marijuana -- i.e., people who haven't also been drinking or taking other intoxicating drugs) cause fewer crashes than people who haven't had any drugs at all.

    That's right, people "high" on marijuana cause fewer crashes than those who are completely sober. The findings seemed impossible to explain. It was a puzzle that made no sense.

    A bright and talented researcher in the Netherlands named Robbe recently solved that puzzle. He got experienced marijuana users stoned and had them drive around the streets of Holland. But these guys were no dummies. They drove slower, increased the distance between their cars and the cars in front of them, and never tried to pass other cars. Folks who smoked a placebo (a non-intoxicating substance made to look and smell like marijuana) drove as they usually did. Alcohol, alone or in combination with marijuana, wrecked driving completely.

    Robbe's results helped explain the accident studies. People who used marijuana and only marijuana were compensating for the drug's effects by driving more carefully. Nobody should drive high, but we can all take a lesson from these people who did: slow down, leave space between your car and the next, and don't try to pass. Unlike alcohol, which makes people behave recklessly, marijuana users tend to be aware that they are impaired and compensate with some success.

    But what about the ONDCP's claim that one in three reckless drivers tested positive for marijuana?

    It's not quite a lie, but it's deliberately misleading. The Drug Czar's no dummy. He wants to scare people, and he knows the complete facts won't do it. Instead he throws out scary but incomplete and misleading statistics - -- and hopes people won't question them. Yes, one in three reckless drivers tested positive for marijuana in a urine screen, but we don't know how many of them had alcohol, antihistamines, cocaine, or any number of other drugs in their systems.

    Legislators need to ask for the complete facts behind the scare stories before they start passing new laws based on misinformation.

    There are cheaper, easier ways to get impaired drivers off the road. Roadside sobriety tests are reliable, inexpensive, and valid indicators of impaired driving. Law-enforcement officers can learn to administer these tests quickly and easily. Unlike expensive blood tests, which can only identify a few drugs, roadside sobriety tests can detect any kind of drug im