On 'Cold Case Files' they solve old murders and it's really interesting. What I learned from it is that it was really easy to get away with murder before they knew about DNA... What was a murder investigation like in 1935? One cop would just walk in and be like, 'Detective, we found a pool of the killer's blood in that hallway.' He would just be like, 'Hmmm, gross. Mop it up. Now then, back to my hunch. Look for clues. I'll tell you what we'll do; we'll draw chalk around where the body is, that way we'll know where it was.'