Excerpt from the following link:
http://norml.org/index.cfm?Group_ID=6821

The length of time cannabis metabolites may be detected, on average, on a standard urine screen is typically no longer than ten days for chronic users and between 3-4 days for infrequent users, according to a literature review published in the current issue of the journal Drug Court Review.

Of course, all the companies with a commercial interest in drug testing, or cheating tests, will disregard this.

Compound the revised detection times with the fact that most schools only pick a small percentage of students from the pool to be tested and you can see why the largest government study on drug testing found no significant difference in drug use in schools with drug testing compared to schools without it.

John Walters really should be ashamed for giving parents a false sense of security. If an overprotective parent really wants drug testing, they should administer themselves, because the schools are not with their children over the weekend, all those holidays and long breaks from school.

It must be nice to live in a world without facts.

Any substance abuse professional will tell you that two items are required to mitigate drug abuse: deterrence and detection.

Both are impossible with a combination of drug testing, education, and support.

The heroin related death of the young woman is an all too common tragedy that’s been prearranged from the outset.

First the Feds reject harm reduction because they want to make the world’s drug playground as nasty and dangerous as possible for the little kiddies who play there as a means of dissuading adults from using recreational drugs.  Once the Feds’ goal is achieved in the persona of a real victim, they capitalize on the tragedy they’ve created by posing it as a symbol to promote more of the very same agenda that initially resulted in that person becoming a victim.  Not only is the government’s reasoning irrational, it’s sick.

So do victims count in this circular strategy, or is this just some way of keeping score?  Perhaps the loss of life created by the bureaucratic game rules in the drug war is as meaningless to the government as Dick Cheney shooting a few individual birds to scare away the flock?

Fortunately, tyranny never lasts.  In the not-too-distant future, drug warriors will be made to face the parents of the many naïve and reckless children who made fatal mistakes with certain drugs and explain to these parents why their son or their daughter had to be the one to die to feed the drug war’s ideological machine.  I look forward to hearing their explanations.

Giordano

And who's responsible for the dubious quality and purity of heroin? Duh!

More likely, though, it was ignorance and fear, not heroin, that killed this girl. It was the lack of honest education about the real-life dangers of drug use -- most heroin overdoses are, in reality, a result of mixing it with other drugs, most commonly alcohol and/or prescription opiates -- added to the fear of prosecution, which prevents people from seeking medical attention.

America's drug policy. Lies, ignorance, violence and fear. Gotta love it.