"Following an initial probe, the city required CPI to hire an outside investigator to figure out exactly what happened and to outline how to avoid such a release in the future, Firth said."
Firth is the Fire Marshal.
I wonder how this be an impartial and fair investigation if CPI hires someone to investigate itself. Sounds strange to me. Why didn't the Fire Department do its own investigation ? Isn't that what they're trained and paid to do? If the Fire Department really can't do the investigation, why didn't they hire some outside investigator?