mm, lie detectors may be good for the "shock Horror my wife slept with your grandad and now who's the father typey shows" aka Jeremy kyle , but are flawed, I blush easily , does that mean if there is a smell in the room and someone say who did that and I blush does it mean i did it ?? not always ..... anyway there is no substitute for good policing , forensics and eye witness , coming together to the same conclusion , a return to old fashioned policing , preserving the scene, ensuring the lab does not contaminate anything at all? and gathering all evidence available without interferance from media etc etc etc surreptisiously convicting a person before the facts are known , there are many crimes unsolved in the world , the fact is someone knows/knew what happened to all the crimes unsolved its just a matter of waiting for there guard to drop ...... anyone for a game of cluedo???