Some criminals never learn. Well, actually most don’t. But when it comes to violence, and hence gun violence, this is an important part of the puzzle. Take-aways 2% of prison admissions are for violent crimes. 64% of admitted prisoners had their first arrest in the teen years. 30% of them account for 51% of prior arrests. Large, Oldish Data, Frustrating Study When a reputable (and positively OCD) organization like the Bureau of Justice Statistics (BJS) reviews over 90,000 newly incarcerated convicts, and repeats the stunt 15 years later, you have an admirably robust study. Which had one aching gap.