"If a State Fire Marshall cannot tell the difference between these detectors, how can I be expected to?" the daycare owner told families.

A Kittery child care center where nearly a dozen people were treated for carbon monoxide poisoning last week did not have a working carbon monoxide detector.

Carbon monoxide is a colorless, odorless, tasteless gas that can accumulate in homes and kill without warning.

A report from the state fire marshal's office sent to parents shows Building Blocks Learning Center had several violations, including a lack of carbon monoxide detectors and fire extinguishers.