these 13 corrections officers being charged are small, small, small percentage of bad apples. reporter: union leaders say they believe the corruption goes high are up. i don t believe the buck stops with the 13. reporter: the root, thy say, lies in understaffed prisons. and allow has street gang to take over. every institution, staffing level is low and on top of that right now they re collapsing posts inside the institutions to save on overtime. reporter: this week the department of corrections began issuing polygraph tests to administrators to see what anyone knew about the scandal. it would expand to other corrections officers starting tomorrow. now because of all this, critics are calling for a change in leadership. at a news conference, governor o malley home called public safety secretary gary maynard one of the best in the nation. there will be more corrections officers as well as citizens because they can see we can be effective in coordinating togethe