Cocaine at a Festival: Could You Still Be Over the Drug-Drive Limit Days Later?
Cocaine clears in hours, but the metabolite benzoylecgonine can keep a driver over the 50 µg/L limit for days: how the science works.
Read articleNewsletter
Occasional, no-nonsense updates from ATXpert: developments in forensic toxicology, drink and drug driving case law, and practical notes on instructing an expert. Written for solicitors and barristers, but readable by anyone following a case.
Past issues
Browse previous editions. New issues are added here as they're published.
Still Over the Limit the Morning After?
Sleep does not sober you up on schedule. How overnight alcohol elimination really works, and how a back-calculation can help.
Read articlePrescription Medication and Drug Driving: Could Your Medicine Put You Over the Limit?
Diazepam, morphine and methadone are all caught by the drug-drive limits, but a statutory medical defence protects those taking them properly.
Read articleParked Up, But The Law Isn’t Idle
A person can commit an offence by being ‘drunk in charge’ even when no driving has taken place, and how the science can help.
Read articleBeyond the Breath Test: Understanding Failure to Provide
Failure to provide an evidential specimen is treated as seriously as drink or drug driving: what counts, and the reasonable excuses.
Read articleA Wee Bit Over The Limit
When urine is the evidential sample: the MG DD/B and MG DD/C procedure, its limitations and the case law that can render results unsafe.
Read articleThe Reliability and Limitations of Roadside DrugWipe Screening Devices
Roadside DrugWipe devices are prone to false positives and negatives: the published error rates, the causes, and why the results are non-evidential.
Read articleExpert Witness Services for Drug Driving Cases
The S5A legal framework, the 17 controlled substances, and the key defences in drug driving cases, and how expert evidence supports them.
Read articleUnderstanding the Role of a Toxicology Expert Witness in Drink Driving Cases
How an Alcohol Technical Defence (ATD) report estimates a driver’s alcohol level at a key moment, and what an expert witness brings to court.
Read articleWhat you'll get
Case-law notes
Plain-English updates on new and notable drink & drug driving decisions.
Toxicology explainers
What blood, breath and urine results really show, and their limits.
Practical guidance
When and how to instruct an expert witness, and what to expect.
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