In the latest episode of the podcast, host David Opie sits down with James Nutt, Laboratory Operations Manager at Cansford Laboratories, to explore a fresh perspective on the use of hair strand testing in the family courts.
This episode delves into the complexities behind what many might see as a straightforward scientific process. James offers an alternative view on how hair samples are prepared, how substances such as drugs or alcohol are extracted and tested, and what the results actually mean when they’re presented in a legal setting.
A key focus of the discussion is the interpretation of results—particularly the often-misunderstood concept of cut-off levels, which determine whether a substance is reported as present or not. James explains the industry standards around these thresholds, their role in ensuring consistency across laboratories, and the importance of recognising both their strengths and limitations.
The conversation also touches on the variability of hair types and colours, external environmental factors such as UV exposure, and even how conditions like pregnancy can impact hair growth and potentially influence results. With such variability, James urges caution against over-reliance on hair strand test results in isolation.
Listeners will also gain insights into how hair analysis can help build a historical pattern of substance use, the challenges of testing for emerging drugs, and the importance of ongoing education and awareness for both practitioners and the courts.
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