NSWC has developed rapidly deployable technology called the Sensor Agnostic Febrile Detection System. This new software can be used with any emissive source detection sensor to accurately detect people in a crowd with a body temperature above a certain norm.

More information can be found at: https://www.navsea.navy.mil/Media/News/SavedNewsModule/Article/2276500/nswc-crane-engineers-develop-rapidly-deployable-tech-for-detecting-fever.