We no longer use Mini-14s, traded for ARs. It's an image thing. Also, we don't do head shots, we train with rifles at 100 yards, and long distance precision shooting is done by our TSU sniper teams, who use a slightly differant platform.
As for shanks, an officer who used to work for me was stabbed last month. Most shanks are covered in feces and blood, in an environment rife with Hep C and AIDS. Getting stabbed with a shank when you are outnumbered 30 to one, (my yard has 1100 inmates, 30 staff.), ranks on the "not good" scale, both in the short and long term.