I don't know that ASCLD/LAB says that, but I do know that any scientist worth their salt will agree with you that without a confirmatory test you can't say something is 'blood.'
That's what 'presumptive' means. It could be blood. Could be something else. That's why NC's SBI was defended so vigorously by certain forensic scientists. When they got a presumptive positive but a confirmatory negative they reported findings 'consistent with human blood.' And it is. Consistent with human blood and some other stuff as well. That last part just didn't make it into the sentence in the crime lab report, and most lawyers didn't know enough to follow up.
Best,
Christine
Christine Funk
Assistant State Public Defender
State of Minnesota
Board of Public Defense
Trial Team
651.539.1046 office
651.357.2883 cell
________________________________
From: forensic-science@yahoogroups.com on behalf of Jonathan Nyce
Sent: Mon 5/2/2011 12:24 PM
To: forensic-science@yahoogroups.com
Subject: [forensic-science] Re:
Hello everyone. I have seen several notes on the internet which state that
ASCLD/LAB requires both a positive Kastle-Meyer test (or other presumptive
test), followed by a positive Takayama microcrystal test before a stain can be
called blood, and a positive precipitin or ouchterlony test before a
KM+/Takayama+ stain can be called human blood. Does anyone know if these
requirements are documented anywhere, and how I can get hold of that
documentation? Thanks- cp
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