During a criminal trial for drug trafficking offences involving cocaine and cannabis, the Crown sought to qualify an RCMP officer as an expert to provide opinion evidence regarding drug trafficking indicators, drug jargon, and related matters.
The defence objected, arguing the proposed evidence lacked relevance and necessity and that the witness lacked independence due to police bias.
Applying the test for expert evidence in R. v. Mohan, the court held that some proposed opinions were relevant and necessary to assist the jury, including opinions regarding the level of trafficking indicated by seized items and the use of drug-related jargon.
However, opinions concerning cocaine purity, the role of weapons in trafficking, and evidence relating to hashish or trafficking hierarchies were excluded as irrelevant or unnecessary.
The officer was qualified to give expert opinion evidence only on limited issues.