Detective Arenas believes that he has found the scene of a crime. He would like to know if there was blood present. Which test should he perform?

Luminol testing is used to detect traces of blood at a suspected crime scene. It reacts with components in blood and can produce a glow, even when the blood is not easily visible. DNA fingerprinting can help identify whose biological material is present, but luminol is the test for locating blood.

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