walton

Many books have been written about the identity of the infamous Whitechapel Murderer of 1888, better known as Jack the Ripper. There are presently about 200 people seriously suspected of having committed the crimes, and their relatives could in many cases still today be traced through historical records. While little crime scene evidence from the murders has been preserved, one anonymous letter written to the police at the time of the murders has been held by many scholars of these crimes to be an authentic letter from the true killer. This letter has a stamp affixed to its envelope, and the glue on the back of that stamp had to be licked -- presumably by the killer -- to be attached, and this letter and stamp are still in the evidence box in the holdings of Scotland Yard.

So the question is: Would there be any prospect of today recovering DNA from the saliva on the back of that stamp, or would it all have evaporated by now, even despite being sealed in glue behind a stamp all these years? If the DNA could still be recovered, it could be compared to the relatives of the existing list of suspects and it might theoretically be possible to solve this crime even now.

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