All of the above has led the European Centre for Disease Prevention and Control to
conclude that, although some COVID-19 cases do get detected through temperature-screening procedures at airports, evidence indicates that such measures on the whole aren’t effective.
In the UK, the Medicines and Healthcare Products Regulatory Agency has similarly
warned that “temperature screening products, some of which make direct claims to screen for COVID-19, are not a reliable way to detect if people have the virus”. The Canadian Agency for Drugs and Technologies in Health also
noted years ago that “the accuracy of infrared skin thermometers is equivocal and requires more research”.