“One of the teacher’s husbands brought a carbon monoxide detector a few hours later to test, and when it was plugged in, the alarm went off immediately.”

https://www.heraldmailmedia.com/news/nation/carbon-monoxide-leaked-for-hours-at-a-virginia-beach-day/article_898a90aa-1648-5ee7-847d-80d8bc73e380.html?utm_medium=social&utm_source=facebook&utm_campaign=user-share&fbclid=IwAR0jsd323zmrGUZJPQqHgcZMkzJNtMtVTj9yb5-9PnvFOReueXcJwuGnnsE