Well I did give a source that made the point specifically that blood has properties that make it hard to remove and findable years later.
Ever get blood on a shirt? Not easy to clean.
Now what ires me a bit here is that you suggest that I don't know something I've given a link to yet you make a claim that Filomena has the same alibi that Amanda does yet you have no source and refuse to acknowledge that even Amanda says she had a solid alibi.
Now I don't claim to be a CSI expert as some others falsely do here but I gave a link and a quote and it does seem that if many substances were as hard to clean and lit up that luminol wouldn't be of much value.
Blood* is one *of the most difficult substances to remove once it has stained a fabric, surface, or laundry.
However, stain removal can be accomplished with some help, usually with everyday items that can be found around the house.
Stone Surfaces
Follow these steps to remove blood stains from Alabaster or Marble:
Wipe stain with a sponge dipped in cold water.
If stain remains, mix a poultice of water, powdered detergent, and chlorine bleach. Apply it thickly to the stain and cover with a damp cloth to retard drying.
When the stain has been bleached out, rinse thoroughly and dry.
Follow these steps to remove blood stains from Bluestone, Brick, Concrete, Flagstone, Granite, Limestone, Masonry Tile, Sandstone, Slate or Terrazzo:
Try wiping up the stain with a sponge dipped in cool water.
If any stain remains, wash or brush (the method of using a stiff-bristled brush to gently remove dried stains and spots) stain with a solution of washing soda or detergent in warm water.
Rinse well and allow to dry.
Blood stains can be especially difficult to remove because the hemoglobin in the blood acts as a binder when it hits the air and binds