Jane Brody has this piece in the New York Times which discusses recent findings regarding how teenagers perceive and deal with risk:

Is it that teenagers think that they are immortal or invulnerable, immune to the hazards adults see so clearly? Or do they not appreciate the risks involved and need repeated reminders of the dangers inherent in activities like driving too fast, driving drunk, having unprotected sex, experimenting with drugs, binge drinking, jumping into unknown waters, you name it?

None of the above, says Valerie F. Reyna, professor of human development and psychology at the New York State College of Human Ecology at Cornell. The facts are quite the opposite. Scientific studies have shown that adolescents are very well aware of their vulnerability and that they actually overestimate their risk of suffering negative effects from activities like drinking and unprotected sex.

That's funny, I thought the psychological community was in agreement that "the characteristics of adolescents" were "as a group, are not yet mature in ways that affect their decision-making." At least that was the position of the American Psychological Association when it came to the juvenille death penalty. Indeed, the APA stated in it's brief that during adolescence the "brain has not reached adult maturity, particularly in the frontal lobes, which control executive functions of the brain related to decision-making." What they failed to mention, however, is that the process of myelination (which is what the APA brief was alluding to) is not complete until around age 50.

A good reason why institutions like APA should not take such strong positions on issues like the juvenile death penalty is because the science is rarely as settled as they make it out to be. We have a lot yet to learn about the human brain and development. Yet, when science enters the legal and political arena it risks its credibility when later discoveries, like those mentioned in the Times article, undermine positions that were so strongly held in the past.