JIM VARNEY / SCIENCE PHOTO LIBRARY JIM VARNEY / SCIENCE PHOTO LIBRARY
Forensic blood test. Image 3 of 5. Forensics officer performing a blood verification test on a stain on the sole of a shoe. She is wiping a swab treated with chemicals over the stain. If the stain is blood, the chemicals react and the swab changes colour. The test being used is the Kastle- Meyer Presumptive blood test. If blood is found on the shoes, its DNA can be extracted and analysed and may provide evidence in a criminal investigation. For a sequence of images of the test, see H200/621 to H200/625.
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