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The wikipedia page has a lot of info on Luminol, but doesn't really answer this question. I researched briefly and came across this abstract from 2013: https://forident.com/research_articles/visual-appearance-and-chemical-detection-of-bloodstains-on-concrete-after-exposure-to-the-elements/

Wow! Just wow!

Maybe she turned on the light before reaching the spot, or could see the blood from the door as she opened it (it would still be light out.) Perhaps she did step in/on it, but it was dried. Or perhaps it was not such a big spot that the chances of her stepping it in were less than not stepping it.

Carey Parker's disappearance is sad. After reading some articles about missing persons being found in vehicles in lakes many years later, I went to Google Earth Maps and looked through all archived images of Lake Tawakoni, even in drought years. The lake is huge, but I saw nothing indicate the...