Airports, office buildings, warehouses and restaurant chains are rushing to install new safety measures like fever-scanning cameras and infrared temperature-sensing guns. But the American Civil Liberties Union warned on Tuesday against using the tools to screen people for possible coronavirus symptoms, saying the devices were often inaccurate, ineffective and intrusive. Natasha Singer writes in the New York Times that in a new report, “Temperature Screening and Civil Liberties During an Epidemic,” the A.C.L.U. said that such technologies could give people a false sense of security, potentially leading them to be less vigilant about health measures like wearing masks or social distancing. The group also cautioned that the push for widespread temperature scans during the pandemic could usher in permanent new forms of surveillance and social control.