There was “insufficient detail” to match Sheku Bayoh’s bootprints to a mark found on a vest worn by a police constable he allegedly stamped on, an inquiry has heard. Alison Marven, who works at the Scottish Police Authority’s (SPA) forensics laboratory, analysed a vest worn by Pc Nicole Short on the day of Mr Bayoh’s arrest and death in May 2015. An inquiry into the circumstances of the 31-year...