JeannieC
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I may be wrong, but I believe it has to be completely dark to see the stuff luminol picks up? So they're not covering luminol but covering the light source. Someone please correct me if I'm wrong or using the incorrect terminology. Just guessing here - TIA!
How Luminol Works
Investigators will spray a suspicious area, turn out all the lights and block the windows, and look for a bluish-green light. If there are any blood traces in the area, they will glow.
http://science.howstuffworks.com/luminol1.htm