Mourners for Chicago student Derrion Albert, who was slain in a melee. (Getty)

The National Center on Addiction and Substance Abuse at Columbia University released a survey that will disturb, but perhaps not surprise, many parents. It says that more than 25 percent of public middle and high school students —  or 5.7 million — report that gangs and drugs are on their campuses. Not every researcher agrees with the findings. But if much of it is true, then the survey shows "a trajectory of tragedy for millions of children and their parents."

Read more at the Los Angeles Times.