The technology provides an external device for estimating a core body temperature of a human subject, and a system for use in a local area, such as a school, hospital, workplace, and the like. The wrist monitor device includes a casing sized and shaped to fit onto a wrist of a human subject. The casing has a first face and a second face. In addition there is a cavity in the casing that houses a heat trap. The heat trap has an opening oriented to receive incoming thermal energy and a shell of a thermal-insulation material that has an inner thermal energy-reflective surface. Detected temperature data is compiled in a database and used to estimate whether an identified individual has a core body temperature indicative of a fever. There is also provided a system for identifying persons and screening the persons for a febrile condition. The system may include the steps of: identifying a person using data input by the individual or detected from indicia of the person and previously stored data about the person; detecting a temperature condition of the person; determining whether the person has a febrile condition using the detected temperature condition and previously stored temperature data of the person; and taking action to restrict ingress, deny ingress or allow ingress, based on the determined febrile condition of the person requiring ingress.
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