Final answer:
Presumptive tests at a crime scene offer quick initial results that guide further investigation despite the possibility of false positives.
Explanation:
Presumptive tests at a crime scene offer the benefit of providing quick initial results that can guide further investigation. For example, in the case of detecting chemical warfare agents, a high sensitivity test like QUISTOR can be advantageous. While presumptive tests can yield false positives, they play a crucial role in the early stages of forensic analysis.
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