14% is huge, especially considering how many people commit crime because their life was destroyed by a drug conviction (their own or their parent's) leading to further crime.
(His book, _Locked In_, is pretty great).
Reminder: nobody, including Pfaff, is saying it's good we lock up drug offenders like this. It's bad, and we should stop. It's just not a solution to mass incarceration. To address that, we need an across-the-board fix for aggressive prosecution, which is what appears to be the most important factor ratcheting up prison populations.