Edited sentence: Both are appointed by the head of the executive branch of the City.Investigations and Research.Oversight of the police (internal affairs) is external force, in charge of the executive branch through the Ministry of Justice and Security.Police will have a unique hierarchical system of seven degrees, which provides an opportunity to each incoming, attain the highest office.Public Security.Scientific and Technical.The police will be headed by a Chief and a Deputy Chief.The structure will be in charge of four areas, each headed by a Director General: