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Mr. Adrian Parsons

Professional Description:

Illicit Domestic Drugs Markets Expert



Area of work:



I have been delivering opinion evidence as a Police Drug Expert witness since 2005.

My main area of expertise lies in the UK Domestic Drugs Supply markets encompassing all drugs and arenas including day time addict markets of Crack & Heroin and the Night Time Economy 'party' drugs including Cocaine, MDMA, Cannabis (& Cultivations) SCRA's and Amphetamines,

Over the last 10 years and up until early 2022, I have personally trained over 400 of the UK's current Police Drug Experts. I therefore understand what they should be saying within their statements, what they should not be saying, and also whether what they are saying is factually correct or whether they are stepping outside their area of knowledge. 

Throughout my time as both a practising expert witness and an expert witness trainer I have been an absolute advocate of the requirement of all law enforcement drug experts to go above and beyond with their impartiality.

I retired from the Police in October 2020 and now own and run Appropriate Training & Consultancy Ltd, delivering bespoke drugs training to Police forces and partner agencies through

For the 5 years up to my retirement, I was the association secretary of the UK law enforcement association DEWVA (Drug Expert Witness & Valuation Association). I am currently an associate member and I am aware of all of the DEWVA guidance that has been produced.

I have been working, on a consultancy basis, since January 2021 providing Encrochat interpretation reports, as a prosecution expert witness, however I am open to instruction from all parties..


UK Law Enforcement Expert Witness Trainer

Expert Training

Provider of Police Expert Witness Training


APCDLO Committee Member / DEWVA Associate Member

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