Three prison guards in British Columbia were sent to hospital, one needing chest compressions in the ambulance, after inhaling what they believed to be fentanyl powder that was "sprayed" around a cell by a combative inmate during a fight with officers, their union says. The toxic substance exposure happened at Pacific Institution in Abbotsford, B.C., on June 11, when three officers entered a cell to conduct a routine search, the union representing federal prison guards said on Monday.