Most Commonly Tested Drugs: Best Practices and Potential Pitfalls

High-Risk Results: Interpreting Cocaine, Cannabis, Ketamine and Heroin in Family Law Cases

Drug testing can reveal complex and sometimes conflicting stories about substance use. In this session, we’ll explore how the “big four” — cocaine, cannabis, ketamine and heroin — appear across different testing matrices, what their presence really means, and how factors like passive exposure, contamination, and metabolite interpretation can cloud the picture.

Using real case examples, the AttoLife team will examine where misunderstandings most often arise — from over-reliance on screening results to confusion around cut-off levels, abstinence periods, and mixed-matrix evidence. Attendees will leave with a clearer grasp of how to interpret results confidently, challenge them appropriately, and ensure testing evidence is presented in a balanced, defensible way in family court.