I think the 'Faces of Meth' program is a good one- you might not be able to turn a tweaker sober, but it appeals to the vanity of people who haven't got caught up in it yet. I think the program was started in the Midwest by an officer who was struck by the marked changes in meth users physical appearances in such short periods of time. He started compiling mug shots, contrasting first pics against ones taken a year or two later. It's scary how much damage it does in so little time.
Here's a few beauties from
Multnomah County.