The police will tell you this. There is no such thing as a perfect crime, never has been and there never will be.
Even 20 or 30 years further on a killer can still be caught with new modern science.
It is paramount to any investigation that the crime scene is examined. WHF had been forensically examined 3 times over a period 2 months. What did they find forensically? Nothing, to link Jeremy to the murders.
Inevitably, an untrained killer will leave some evidence.
Fingerprints
Shoe Prints
Hair
Fibres
Witnesses
At least something that places the person that is under suspicion at the crime scene. Luminol is a chemical substance that shows blood in the dark. No matter how blood had been cleaned up Luminol will show it up, not even bleach can shift blood.
If you look at the kitchen floor alone, there appears to be no footprints on it. Yet from the amount of blood in the house, you would think a print would have been there and on the carpets. Luminol can show where a killer walked, it can show where a person entered a room more than once. Luminol will show up blood that can't be seen by the naked eye. It can show the size of foot/shoe print. 30 years on this method could still be used on floors, windows and even the silencer.
The lack of fingerprints on the rifle or none identified prints nearly 30 years can still be processed by the use of reversing the fingerprint. This is mainly done when a finger has touched a different surface then touched the rifle again. What happens is that the blood is taken from the prominent part of the ridges and if a print is reversed it can match up....
These are just two of the ways modern science can make a difference to a case, apart from DNA.
But, the destruction of evidence before the breakthrough of modern science has made some techniques impossible....
Anybody with me on this? Adam?


?? lol