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Prof. Atholl Johnston

Professional Description:

Clinical & Forensic Toxicology


BSc, BA, MSc, PhD, CSci, ERT, FFPM, FBPhS, FRCPath

Analytical Services International Ltd
St George's University of London
Cranmer Terrace
SW17 0RE
Area of work:

Greater London, Nationwide and International


Analytical Services International Ltd (ASI) is ISO 17025 accredited and offers a wide range of clinical and forensic toxicology services to lawyers, law enforcement agencies, social services and the public.

ASI provide opinions on cases involving the administration of prescription medicines, drugs/alcohol and driving, drugs and hair testing, drugs and child custody, illicit drug use, drug-assisted sexual assault and the interpretation of forensic toxicology reports.

We also provide expert opinions on the reliability of methods used to measure drugs, drug pharmacokinetics and statistical analysis of data.

We measure drugs and naturally occurring compounds in biological fluids at our laboratory on the St George's - University of London Campus, and perform drug and alcohol analyses in blood/urine for Road Traffic Act cases. The laboratory is ISO 17025 accredited for the analysis of Road Traffic Act alcohol samples and Section 5A drugs in blood. ASI is compliant with the Forensic Science Regulators Code of Practice and Conduct in relation to their Forensic Activities (See UKAS certificate 7641 -


President of Clinical and Contract Research Association; Royal College of Pathologists; Royal Society of Medicine; Royal Statistical Society, European Registered Toxicologist.

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