Does it work? It's the big question for parents of the more than 1 million American teenagers who need treatment for substance abuse. Until now, they've had nowhere to turn. But this week, Drug Strategies, a respected research institute, will post a comprehensive guide to treatment programs for 12- to 17-year-olds on drugstrategies.org. Experts evaluated 144 programs on nine criteria, from family involvement to "treatment outcomes," though only 10 had hard data on their success rate. One key finding: there's no correlation between the cost of a program and its effectiveness.