"Intelligence Community assesses that 20 percent of detainees transferred from Guantanamo are confirmed or suspected of recidivist activity. ... I want to underscore the fact that all of these cases relate to detainees released during the previous administration and under the prior detainee review process."
As we've previously reported, the problem with referring to these numbers (which themselves have not been substantiated by the Pentagon) as "recidivism" is that it wrongly assumes that all Gitmo detainees were terrorists when they were captured.
As a New York Times correction on the matter put it last year, the use of the term "accepted a premise of the [DOD] report that all the former prisoners had been engaged in terrorism before their detention. Because that premise remains unproved ..."