To avoid false alarms as much as possible, regular maintenance of the smoke detector is crucial. The device should be tested about once a month to ensure it's still functioning properly - often a ...

Drugs and explosive chemicals are difficult to detect, but a device more sensitive than a dog’s nose can pick up their traces ...

That is what’s known as the “end-of-life” chirp: When your smoke detector lets you know that it can no longer do its job, and now must die (i.e. you have to replace it with a new one).

A few buses and light-rail trains in King County are being outfitted with fentanyl detectors, in a research program to determine how drug smoke circulates toward transit drivers.