Employees at Miami International Airport who go through the standard security check for weapons and other prohibited items now have another layer of screening before they start work: a sniff test from Cobra and One Betta.

Cobra, a female Belgian Malinois, and One Betta, a Dutch shepherd, are 7-year-old dogs trained to detect the presence of the coronavirus. The keen-nosed canines are part of a pilot program at Miami International, one of the nation’s busiest airports — and the first to employ dogs in the battle against the coronavirus.

Cobra and One Betta will spend their shifts sniffing the face coverings of employees passing through a checkpoint to detect the presence of the virus in sweat, breath and scents due to metabolic changes that the virus causes in the human body. If a dog signals the odor of the virus on a person, that individual will be asked to take a rapid coronavirus test, the airport said.