Can be is meaningless. You need to establish it always degrades blood to the point that one can NEVER EVER successfully obtain a testing result. You can't establish such because it is not true. There are numerous cases where blood evidence was used after super glue fuming. That is true of both conventional as well as DNA testing of blood.
When bodies are left outdoors exposed to the elements for long periods before being found there is a good chance DNA and other evidence will be washed away or so badly decomposed so that no successful results can be obtained. Yet on some occasions such results still have been successfully obtained. In such a case you would want to argue the results must have been fabricated because they can never be obtained but there is no such hard and fast rule.
You are doing the equivalent here. You want to argue it is not possible for results to be successfully obtained and thus they must have been fabricated. You are taking passages that say it is possible for the evidence to be spoiled and choosing to interpret such as a hard and fast rule that it will be damaged and no result can ever be obtained. You are not choosing such position because science tells you this is the case, you have no such sources. You take this position because your goal is to dismiss the evidence and inventing such a hard rule is the only way for you to be able to do so. There is no such rule though. Nothing is going to come of this.
Rigorous testing will be carried out which will include blood samples the size of the flake introduced to Parker Hale silencers to mirror the location of the flake. The fuming chamber will be set to also mirror the settings applied to the silencer in JB's case. If the blood samples are then unable to yield results for testing of blood serology its game over for the flake.
DNA had not even been envisaged at the time of JB's trial. I've already pointed out in post #1 and #13 that blood samples for DNA testing do not need to be of the same quality as blood samples for blood serology testing.
http://www.crime-scene-investigator.net/blood.html Conventional serological analysisAnalysis of the proteins, enzymes, and antigens present in the blood. These substances are more susceptible to degradation than DNA and this type of testing usually requires a "large" sample (quarter size) in good condition for optimal results. This type of testing is rarely statistically individualizing.
Restriction Fragment Length Polymorphism (RFLP) DNA analysisDirect analysis of certain DNA sequences present in the white blood cells.
DNA is much less susceptible to degradation than proteins, enzymes, and antigens. RFLP DNA testing is commonly statistically individualizing (one out of several million or several billion)
Polymerase Chain Reaction (PCR) DNA analysisAnalysis of certain DNA sequences that have been copied multiple times to a detectable level.
PCR based testing works well on degraded samples and "small" samples (pinhead size).
ABO PGM EAP AK Hp
Nevill Bamber O PGM1+ EAP BA AK1 Hp2-1
June Bamber A PGM1+ EAP BA AK2-1 Hp2-1
Daniel Caffell O PGM2+1+ EAP B AK1 Hp2
Nicholas Caffell O PGM2+1+ EAP B AK1 Hp2
Sheila Caffell A PGM1+ EAP BA AK1 Hp2-1
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Blood In Silencer A Nil EAP BA AK1 Hp2-1
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Robert Boutflour A PGM1+ EAP BA AK1 Hp2-1
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ABO = Blood Group System (Antigens)
PGM = Phosphoglucomutase (Enzyme) Breaks down quickly outside the body hence blood in silencer was unable to produce a reading
EAP = Erythrocyte Acid Phosphatase (Enzyme)
AK = Adenylate Kinase (Enzyme)
HP = Haptoglobin (Protein)