Why do we let cops be our "drug experts"?

We see this at all levels, from the local DARE officer misinforming the kids to national law enforcement associations lobbying for more funding to top cops explaining why marijuana is not a medicine. All will tout the dangers of their target drug du jour, and we listen to them as if they knew what they were talking about. Why? Police presumably "know" about correct drug policy because they deal with messed up drug offenders. But police also deal with domestic violence incidents, and we don't assume that makes them experts on marriage. (For anyone who does assume that, check out their divorce rates [5].) Law enforcement is not a dispassionate, disintered bystander in the debate over drug policy. It sucks greedily on the taxpayer's teat for ever-increasing funding, and it manufactures drug threats to do so. I await breathlessly the arrival of the "new heroin" or the next "worse than crack" drug, and I'm sure the cops are going to tell me all about it and explain why they need more money to fight it. Even if we are generous and grant that people in law enforcement want to do the right thing and save people from themselves, they are not the right people to be teaching our kids about drugs. The latest exhibit comes from Biloxi, Mississippi, where the local newspaper had a story with this headline: Officers Give Biloxi Students the Truth About Illegal Drugs [6]. Here are the three "truths" I could discern from reading the article:

The police investigator told the group that " Young people are actually taking this frog and licking it." The students couldn't believe their ears. Then the investigator explained how licking a certain kind of frog has the same effects as using LSD. He also said there were people willing to do it to get high. "Are you serious? A frog?" asked one boy. "That's nasty," a girl chimed in.

The cop is referring to the Sonoran Desert Toad [7], which indeed excretes an hallucinogenic substance when agitated. I am unaware of any contemporary reports of a psychedelic toad-licking trend, but thanks, officer, for making the kids aware of this bizarre drug-taking possibility. The second "truth" I discerned from the article is this one:

Richard Robinson said the most surprising thing he learned was "That crack kills."

It's not quite so simple. Yes, one can die from a cocaine overdose, typically from cardiac arrhythmia, but I'm unaware of any wave of crack-related heart attack deaths. (Am I wrong? Anyone?). I did find one five-year study of Brazilian crack users [8] that looked at 124 chronic users. After five years, 40% reported not using within the last year, and 23 of the original cohort had died during the five-year interim, a mortality rate above average. But the study noted that the most common cause of death was homicide, not drug overdose. Crack kills? Sometimes, maybe. But far, far more often, not. Finally, the third "truth" I discerned from the article:

"We try to help them to determine what's real and what's not real. What's falsehood and what's a myth," said Sgt. Jackie hodes. "There's a myth that marijuana doesn't hurt you but it does. It definitely hurts you. It destroys your brain cells. So we just try to give them some truth so they can make more informed decision."

Truth, huh? Here's the skinny on the tired old "marijuana kills brain cells" meme, courtesty of the Drug Policy Alliance's marijuana myths pages [9]:

Myth: Marijuana Kills Brain Cells. Used over time, marijuana permanently alters brain structure and function, causing memory loss, cognitive impairment, personality deterioration, and reduced productivity. Fact: None of the medical tests currently used to detect brain damage in humans have found harm from marijuana, even from long term high-dose use. An early study reported brain damage in rhesus monkeys after six months exposure to high concentrations of marijuana smoke. In a recent, more carefully conducted study, researchers found no evidence of brain abnormality in monkeys that were forced to inhale the equivalent of four to five marijuana cigarettes every day for a year. The claim that marijuana kills brain cells is based on a speculative report dating back a quarter of a century that has never been supported by any scientific study.

I ask again: Why do we let cops pose as "drug experts"?