On the ground results would appear to indicate that such 'psych' exams/evaluations are fairly worthless.  [Based on problems in any number LE and Correction Dept's].  Trouble is, psyche medicine is not really a science yet, but largely just speculation backed by a certain amount of observation by people w/unknown biases.   

Also, abusive and/or indifferent or negligent attitudes are often a matter of peer-group culture, so a person may come in w/no inclination to abuse, but become abusive or indifferent to abuse by his co-workers, Because it is accepted/normal behavior w/in the work environment, or as a result of being ridiculed for objecting.  DOC has some Serious problems, and DOC medical hires appear to need to go back for re-training - or better yet, go into another field of work.