What is a downfall of utilizing presumptive tests?

They are not up to date with technology

They only work on fresh samples of blood

A certain amount of blood is required for the test to work properly

They can produce false-positive results

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.