Each member of the police department shall have the power and authority within the limits of the city, to serve and execute warrants or other legal process for the apprehension and commitment of persons charged with or held for the commission of any crime or misdemeanor or the violation of any provisions of this code and while serving or executing or assisting in the serving or executing of any such warrant or legal process shall be vested with all the common law and statutory powers of constables for such purposes. (1950 Code)