As of at least February 8, 2021, the USCIS Philadelphia Field Office has a few new procedures for checking in. First, there are no longer any live officers at the reception desk. Instead, they have an officer who appears over video chat on an iPad at the Reception Desk. Second, there is an electronic temperature taker next to the iPad where you must position your forehead so that the machine can scan for your temperature. Presumably, if you have a fever, the scanner will detect it.