Unfortunately, in the absence of more tangible proof such as a bus-ticket stub, a restaurant receipt, or a signature in a guest-house visitors' book, this is precisely the kind of information a court of law would require of someone who was trying to prove his whereabouts in a given place at a given time.
I think you are incorrect. As the trial judge made clear, there was no requirement on the part of Hanratty to prove his alibi
Having done jury service (and on a murder case as well...) I'm aware that a defendant does not have to prove his alibi - it's up to the jury to accept it or reject it.
If the car was effectively wiped clean of substantive evidence then that suggests a pretty clinical operation took place. None of this is compatible with the prosecution version of a car being driven erratically through North London after the crime had been committed by a gear-crashing road hog.
The lack of forensics in the car is one of this case's unsolved mysteries. Obviously, the car's interior must have been cleaned very thoroughly, but when, where, and by whom? It must have been wiped down and, possibly, the floor brushed or sponged, and to avoid being spotted the process of cleaning may well have been carried out before it was fully daylight. Such a thorough cleaning could only be carried out if the car was stationary and, presumably, hidden from sight of busy roads. Was there sufficient material already available in the car to very effectively clean it?
The adhesive-tape technique was known to Scotland Yard at the time, and this was (and is) fairly standard practice to collect individual hairs, etc. Yet 'legitimate' hair was found, but no 'third party' hair. No fibre from the third party's clothing? No non-local mud, grass, dirt, etc., from his shoes? Lack of third-party finger-prints I can understand.
Assuming that the car received a thorough valeting, then why wasn't the gun disposed of at or around the same time? Sensible I'd have thought to dump the gun in dense undergrowth or preferably water somewhere away from the crime-scene.
As an aside, the Great Train Robbers claimed to have paid someone to clean up Leatherslade Farm after the robbery - this was either never done, or was poorly done, as the police found abundant forensics to link most of the accused to the farm.
Graham
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