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Age of blood stain can be determined by, except

  • A.Colour change
  • B.DNA
  • C.Globulin/Albumin ratio
  • D.Protein patterns

Answer: B

The age of a bloodstain can be estimated from the change in colour (red to brown to black), from the globulin to albumin ratio and from changes in the protein pattern as the stain ages. DNA is a stable molecule that identifies who the blood came from, and it does not give a reliable measure of how old a stain is, so it is the exception in this question. The keyed answer is therefore DNA.

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