The district is authorized to maintain a police department. The employees of the district that are appointed as members of such department by the general manager and duly sworn are peace officers; provided, that such officers shall not exercise their powers or authority except as provided in Chapter 4.5 (commencing with Section 830) of Title 3 of Part 2 of the Penal Code. The district shall adhere to the standards for recruitment and training of peace officers established by the Commission on Peace Officer Standards and Training pursuant to Title 4 (commencing with Section 13500) of Part 4 of the Penal Code.