FDA Alerts Public about Improper Use of Thermal Imaging Devices; Warns Firms for Illegally Offering Thermal Imaging Systems for Sale News provided by Share this article Share this article SILVER SPRING, Md., March 4, 2021 /PRNewswire/ -- The U.S. Food and Drug Administration today alerted consumers, health care providers and other users of thermal imaging systems intended to measure human body temperature—also known as telethermographic systems, infrared thermographs, thermal cameras, and "fever cameras"—that improper use of the systems may provide inaccurate temperature readings due to a variety of factors. Additionally, the FDA issued several Warning Letters to certain firms offering unapproved, uncleared, and unauthorized thermal imaging systems for sale.