Do PSA's work?

You see them all the time on TV telling you to read more with your kids, don't drink and drive, watch for drug use in your family, and so many more messages. But just because they keep airing doesn't mean they work by default.

I highlighted the Montana Meth Project PSA campaign last year based on its raw honesty and sheer dark power. But the results are in and they are staggering.

Since the campaign was started teen meth use is down 45% and adult meth use has fallen by 72%. Other states with meth problems have begun running the ads, including Arizona and Illinois.

Wow...that's tangible results! Check out some more shocking PSA's and see if they worked. (WARNING :: some of these are shockingly realistic and gruesome)