Colorless, odorless and tasteless, carbon monoxide has no warning signs.
When it escaped in an LDS meeting house Sunday in Provo, Utah, it poisoned 60 people.
Such an event is entirely avoidable, but the government only requires carbon monoxide detection systems in some buildings. Churches aren't in that select group.
"The code is a minimum standard," Ted Black, the state's deputy chief fire marshal said . "If you don't feel safe in your home or your environment, you have the opportunity to change that."
Utah's fire code is written to protect the largest number of people from the most common safety problems in a way that is the least intrusive and expensive as possible.
Most additions to the code over the years happen in response to a tragedy of some kind in Utah, or elsewhere in the U.S.