For criminal history checks, a residential service agency is an adult dependent care program (Health-General §19-1901(b)(6)). "Before an eligible employee may begin work for an adult dependent care program, each adult dependent care program shall, for each eligible employee": apply for a State criminal history records check or request a private agency background check, and request a reference from the potential employee’s most recent employer (§19-1902(a)). That reference request "shall, at a minimum, seek information about any history of physical abuse on the part of the potential employee" (§19-1902(b)).
The statute asks for the application before work begins; it does not say the results must be back first. COMAR’s screening list adds license and certification checks, health and TB screening, references, employment history, the I-9, identity, an in-person interview and a skills assessment and demonstration, the last two before referral to clients (COMAR 10.07.05.10B(1)). Neither the statute nor the RSA rules list offenses that bar someone from the work.