A screening tool is NOT a diagnostic tool. When a screening tool detects a possible abnormality, the next step is to follow up and either confirm or rule out the suspicion. There is nothing wrong with using this tool as long as they have measures in place to follow up on an abnormal result. There are oral thermometers which have disposable covers which can be used to confirm or rule out a high temp. If the price of a fever is forcible quarantine, it should AUTOMATICALLY follow that an abnormal measurement be confirmed by reliable follow up.