From CNN:
"U.S. authorities charged four people in Detroit on Wednesday with e-mailing fraudulent sales pitches for weight-loss products, the first criminal prosecutions under the government's new "can spam" legislation."
http://www.cnn.com/2004/LAW/04/28/in....ap/index.html

This law came into effect on the 1st January 2004 and they are now charging four people for spamming. That's right.... Moving at nearly the speed of light, US authorities have taken a mere four months to bring charges against four spammers. That's one spammer per month brought to justice.

As long as they can keep this pace up the world's spam problems will be over before you know it!