hacksaw blades, anything that -- a metal rod. in our ovens you have the grills that you put in the oven to cook on. they'll break off the rods on that. here's a shampoo bottle that was just once a plastic bottle, they've melted down and converted that into a weapon. >> getting caught with a jailhouse weapon is a serious offense. which is why gang members take extreme measures to hide them. >> what we have here is the first one looks like a wire shank. basically, they've recovered that off a vent. these two are both shoe shanks. there's a metal support in different types of shoes, basically all shoes. they take them out and file them to a point also to one end and use them as a -- either a stabbing device or what have you. >> unfortunately for the inmates, the osj unit can't prevent all acts of violence inside the jail. sometimes they get there too late.