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Those interested in this might also like to look at the issues raised by Dr Richard Sleeman of Mass-Spec Analytical Ltd and myself https://www.criminallawandjustice.co.uk/features/Case-Defence-%E2%80%93-Bias-Forensic-Decision-Making-Process which takes on the systemic bias in evidence collection issue head-on.

There are labs around doing first-class forensic work (indeed, in the case of MSA they have sponsored much pioneering forensic work published in a plethora of professional journals).

At the end of the day, science is only as good as the quality of the scientific thinking and the failure to choose tests designed to disprove the ypothesis is a common problem.