Secure and Fair Enforcement Banking Act of 2019 or the SAFE Banking Act of 2019 This bill generally prohibits a federal banking regulator from penalizing a depository institution for providing banking services to a legitimate marijuana-related business. Specifically, the bill prohibits a federal banking regulator from (1) terminating or limiting the deposit insurance or share insurance of a depository institution solely because the institution provides financial services to a legitimate marijuana-related business; (2) prohibiting or otherwise discouraging a depository institution from offering financial services to such a business; (3) recommending, incentivizing, or encouraging a depository institution not to offer financial services to an account holder solely because the account holder is affiliated with such a business; (4) taking any adverse or corrective supervisory action on a loan made to a person solely because the person either owns such a business or owns real estate or equipment leased or sold to such a business; or (5) penalizing a depository institution for engaging in a financial service for such a business. As specified by the bill, a depository institution or a Federal Reserve bank shall not, under federal law, be liable or subject to forfeiture for providing a loan or other financial services to a legitimate marijuana-related business. The Government Accountability Office must report on (1) access to financial services for minority-owned and women-owned marijuana-related businesses; and (2) the effectiveness of suspicious-transaction reports at finding engagement with organized criminal activity in jurisdictions that allow the cultivation, sale, or distribution of marijuana.