>> attention, donnor cos! [ bleep ] >> that was our greeting. >> to battle overcrowding, officer cavagnolo's donner unit houses inmates meant to be segregated from the general population within feet of mainline inmates. >> we have in this unit, we have 2 1/2 tiers of administrative segregation, and the bottom half is a reception center. it makes it really difficult for us, because inmates on the bottom half of the unit, they have access through a lot of different parts of the institution, and then our challenge we have in administrative segregation is the inmates make fish lines and they'll tie a little weight to it and pass it down and pass kites or weapons, so it's a constant battle. just controlling contraband and keep an eye on these inmates, keep them in order. you never know what you're going to get in here.