(a) Notwithstanding any other provision of law to the contrary, a person is ineligible for parole for a period of three years if he or she is sentenced to the custody of the commissioner of corrections for service of a sentence of incarceration and is convicted of a felony violation under the provisions of subdivision (i), subsection (a), section four hundred one of this article for distribution of a controlled substance and:

(1) Is twenty-one years of age or older at the time of the distribution upon which the conviction is based, and the person to whom the controlled substance was distributed was under the age of eighteen years at the time of the distribution; or

(2) Is eighteen years of age or older and the distribution upon which the conviction is based occurred in or on, or within one thousand feet of, the real property comprising a public or private elementary, vocational or secondary school or a public or private college, junior college or university in this state.

(b) Notwithstanding any other provision of law to the contrary, a person is ineligible for parole for a period of two years if he or she is sentenced to the custody of the commissioner of corrections for service of a sentence of incarceration and is convicted of a felony violation under the provisions of subdivision (ii), subsection (a), section four hundred one of this article for distribution of a controlled substance and:

(1) Is twenty-one years of age or older at the time of the distribution upon which the conviction is based, and the person to whom the controlled substance was distributed was under the age of eighteen years at the time of the distribution; or

(2) Is eighteen years of age or older and the distribution upon which the conviction is based occurred in or on, or within one thousand feet of, the real property comprising a public or private elementary, vocational or secondary school or a public or private college, junior college or university in this state.

(c) The existence of any fact which would make any person subject to the provisions of this section may not be considered unless the fact is clearly stated and included in the indictment or presentment by which the person is charged and is either:

(1) Found by the court upon a plea of guilty or nolo contendere;

(2) Found by the jury, if the matter be tried before a jury, upon submission to the jury of a special interrogatory for such purpose; or

(3) Found by the court, if the matter be tried by the court without a jury.

(d) Nothing in this section shall be construed to limit the sentencing alternatives made available to circuit court judges under other provisions of this code.