This looks like another variation of the "scared straight" scams that are shown not to change impulsive behavior....
At first glance, it seems these schools shouldn't work, said Michael Shively, a researcher who recently completed the first comprehensive study of the San Francisco program for the National Institute of Justice. The one-day, throw-everything-at-them-and-see-what-sticks approach, he said, lacks the intense, targeted and longer-term therapy that is generally thought to be needed to change a person's behavior.I am skeptical of this statistic because a lot of things can change in 10 years. It depends on there being a credible control group (similar offenders assigned to a non-treatment social group). There is often a benefit in giving people attention of any kind, but the "scared straight" component is usually ineffective.
Indications are, however, that the classes are a relatively cheap and effective carrot to dangle in front of johns. California prostitution arrest records, Shively's team found, show that recidivism rates among San Francisco men dropped 30% in the decade following the launch of their john school. A newer program in San Diego posted similar results, he found.
See my essays, Words Don't Work and Things You Don't Need: Addiction Treatment.