55 Pa. Code § 3800.255
This section cited in 55 Pa. Code § 3800.6 (relating to applicability to specific facility types); 55 Pa. Code § 3800.251 (relating to additional requirements); 55 Pa. Code § 3800.302 (relating to exceptions for outdoor and mobile programs); and 55 Pa. Code § 3800.311 (relating to exceptions for day treatment).