I don't believe that document would actually refer to those who had taken programs of substance abuse, exactly. If you're talking about general admission rates, there have been some increases and some warrant of a committal. Again, it needs to be contextualized relative to the actual numbers there.
What I can show you is that for those who have taken substance abuse programs, there is a strong correlation relative to not returning, not recidivating as much as those who have not taken the programs from the control groups on all levels of parole.