... taken from the Velcro strap on Sarah's shoe using a low-powered microscope. Four of the fibres were matched to Whiting's red sweatshirt using a high-powered microscope. This technique was used to identify the shoe as Sarah's - the blue polyester and cotton fibres found on the shoe matched her school sweatshirt. Identification of Sarah's badly decomposed body was done via DNA profiling using muscle from the body which provided a full DNA profile and matched to a full profile obtained from a milk tooth saved by Sarah's mother. In 2001/2 DNA profiling was used in approximately 1/2 of all cases compared to 1/4 in 1997/8.2 In the case of Marion Crofts,3 FSS scientists played a crucial role in helping police find her attacker 20 years later. Scientists, knowing that DNA profiling techniques were rapidly advancing, left a laboratory microscope slide containing samples from Marion's body untouched until such a time when they could ...

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