The Secretary must authorize to each employee of the Department exercising the powers of a peace officer a distinct badge that, on its face, (i) clearly states that the badge is authorized by the Department and (ii) contains a unique identifying number. No other badge shall be authorized by the Department. Nothing in this Section prohibits the Secretary from issuing shields or other distinctive identification to employees not exercising the powers of a peace officer if the Secretary determines that a shield or distinctive identification is needed by the employee to carry out his or her responsibilities.