Even in China, the police are now wearing helmets with thermal cameras attached to them, so they know if a person has a fever or not.
This article below explains how the Corona Virus is being detected around the world. Like in China Thermal screening is used almost everywhere now including police helmets.
"However, during the current outbreak with the novel coronavirus 2019-nCoV, the majority of exported cases were detected through entry screening. The risk of importation of the disease may be reduced if temperature screening at entry is associated with early detection of symptomatic passengers and their referral for medical follow up."
America has a long way to go to be able to combat these new threats to our lives.