Overview
- UBC researchers published a trio of papers Tuesday that compile tests and reviews showing large error rates in ballistics, bloodstain pattern analysis and sniffer‑dog alerts.
- Practical testing cited by the papers found firearms examiners misidentified bullets about 37 percent of the time and bloodstain analysts correctly classified patterns roughly 70 percent on hard surfaces and 62 percent on fabrics.
- A study highlighted in the review found nearly 75 percent of police sniffer‑dog alerts in an Australian sample did not lead to drugs, and dogs can false‑alert because of handler cues, residual odours or poor training.
- The papers document methodological gaps, inconsistent results between examiners and influence from case information, and they urge judges to act as gatekeepers to ensure expert claims rest on validated science.
- Authors recommend clearer standards, certification, performance monitoring and greater scientific literacy for judges and lawyers, changes that could alter how courts admit evidence and how police use sniffer dogs.