> The machine operates by releasing multiple puffs of air at a passenger who is standing upright within the machine. This will flush out any particles on the person inside the machine then analyze and identify them in seconds.[6] According to an article in the 16 June, 2005, New York Times, it is capable of screening up to 180 passengers an hour.[7] This sample is then analyzed using IMS or MS technology to search for specific explosive or narcotic compounds. If a substance of concern is detected, the security personnel are notified by a visible and/or audible alarm.
They had puffer machines for people in 2006. They stopped using them because they required regular maintenance. Then they replaced them with the body scanners, which cost more than the puffer machine and a full time maintenance person in every airport in the country combined.
https://en.wikipedia.org/wiki/Puffer_machine
> The machine operates by releasing multiple puffs of air at a passenger who is standing upright within the machine. This will flush out any particles on the person inside the machine then analyze and identify them in seconds.[6] According to an article in the 16 June, 2005, New York Times, it is capable of screening up to 180 passengers an hour.[7] This sample is then analyzed using IMS or MS technology to search for specific explosive or narcotic compounds. If a substance of concern is detected, the security personnel are notified by a visible and/or audible alarm.