The leak of the lethal, colorless, ordorless gas sent more than 30 students from the school to the hospital Monday. But All were treated and released.
The district discovered Wednesday after looking at school videotapes that the workers had done maintenance on the furnace last Friday, Davis said at a morning news conference.
“Neither of these two individuals came forward,” Davis said. “To say that is a disappointment is an understatement. We have now launched a full investigation of that.”