(a) Any person who has been convicted for the first time, under the laws of this state, the United States, or any other state, of any criminal offense involving the manufacture, distribution, sale, or possession of a controlled substance, marijuana, or a dangerous drug shall be ineligible for any public employment for a period of three months from the date of conviction.

(b) Any person who has been convicted two or more times, under the laws of this state, the United States, or any other state, of any criminal offense involving the manufacture, distribution, sale, or possession of a controlled substance, marijuana, or a dangerous drug shall be ineligible for any public employment for a period of five years from the most recent date of conviction.