This episode, the victim bones was stuck in some concrete at the construction site. So, the recover the bones from the concrete is impossible because if u break the concrete, the bones will also falls apart. What they do is that, they using some kind of machine to build the replica of the bones made out of plastic (the blue thingy) using laser, according to the structure of the bones in the concrete.
..and voila!! here the plastic bones with a remarkable amazing details.
I wonder if our country got this kind of machine..haha..