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Blood Spatter Part Al the crime scene, what test would you use to identify and look for the presence of blood? Explain why th

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Answer #1

Castle mayer test is widely used to detect blood stains on crime scene, the sample collected with swab on which drop of phenolphthalein reagent is sprayed and after while h2o2 is added, if the sample is positive for blood swab turns to pink rapidly.

Castle mayer test have limitations for example phenolphthalin turns pink by reacting with other metal oxidants like nickel even before adding h2o2. Hence it is not conformatory test for blood stains. The conformatory test usually gives less false positive results for example ouchterlony test which is a common conformatory test.

2) 1: transfered blood stain

2:contact blood stain

3:spattered blood stain

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