(a) Unless otherwise provided under W.S. 35-7-1031(c), any person convicted of a second or subsequent offense under this act may be imprisoned for a term up to twice the term otherwise authorized, fined an amount up to twice that otherwise authorized, or both. The judge may suspend part or all of the discretionary portion of an imprisonment sentence or fine under this subsection and place the defendant on probation pending successful completion, at the defendant's own expense, of a chemical addiction evaluation or treatment program prescribed by the judge.
(b) For purposes of subsection (a) of this section, an offense is a second or subsequent offense if, prior to his conviction of the offense, the offender has at any time been convicted under this act or under any statute of the United States or of any state relating to narcotic drugs, marijuana, depressant, stimulant or hallucinogenic drugs.
(c) This section shall not apply to offenses under W.S. 35-7-1031(c).