Thread:Rocketlauncher22/@comment-29711200-20161217045511/@comment-29585050-20161219062452

I'm sure we can use a black light to show whose hands have bloodstains.

Even if someone has sucessfuly erased the blood, the haemoglobin left on their hands will be intact. So, if a luminol is dropped n their hands/black light shone upon their hands, we'll know who have killed Jack