IAI CSSA Practice Questions - IAI Certified Senior Crime Scene Analyst (CSSA) Exam

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A senior CSI supervisor approves the use of phenolphthalein as a presumptive blood test on a porous fabric. Which limitation must the analyst disclose at trial?

Phenolphthalein is confirmatory for human blood Phenolphthalein gives false negatives with bleach Phenolphthalein is presumptive only and may react with some plant peroxidases and oxidizers; it does not confirm blood or human origin Phenolphthalein destroys subsequent DNA analysis

Correct Answer:

Phenolphthalein is presumptive only and may react with some plant peroxidases and oxidizers; it does not confirm blood or human origin

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