55 Pa. Code § 148.16
If a recipient is absent from the United States, which includes the fifty States, the District of Columbia, Puerto Rico, the Virgin Islands, Guam and the Northern Mariana Islands, the following requirements apply:
(1) The absence of a recipient from the United States for a period of 30-calendar days or longer is considered prima facie evidence of the intent of the recipient to have changed his residence to a place outside the United States unless:
(ii) The recipient has not acted to establish residence outside the United States. If the recipient is claiming that he is prevented from returning to this Commonwealth at the end of 30-calendar days, the recipient or a person acting on the recipient’s behalf shall provide written evidence of the circumstances which prevent the return.