(1) If a person is charged under sub.
(2m) with a felony offense under this chapter that is a 2nd or subsequent offense as provided under sub.
(3) and the person is convicted of that 2nd or subsequent offense, the maximum term of imprisonment for the offense may be increased as follows:
(a) By not more than 6 years, if the offense is a Class C or D felony.
(b) By not more than 4 years, if the offense is a Class E, F, G, H, or I felony.
(2m)
(a) Whenever a person charged with a felony offense under this chapter may be subject to a conviction for a 2nd or subsequent offense, he or she is not subject to an enhanced penalty under sub.
(1) unless any applicable prior convictions are alleged in the complaint, indictment or information or in an amended complaint, indictment or information that is filed under par.
(b) 1. A person is not subject to an enhanced penalty under sub.
(1) for an offense if an allegation of applicable prior convictions is withdrawn by an amended complaint filed under par.
(b) 2.
(b) Notwithstanding s. 971.29 (1), at any time before entry of a guilty or no contest plea or the commencement of a trial, a district attorney may file without leave of the court an amended complaint, information or indictment that does any of the following: 1. Charges an offense as a 2nd or subsequent offense under this chapter by alleging any applicable prior convictions. 2. Withdraws the charging of an offense as a 2nd or subsequent offense under this chapter by withdrawing an allegation of applicable prior convictions.
(3) For purposes of this section, a felony offense under this chapter is considered a 2nd or subsequent offense if, prior to the offender’s conviction of the offense, the offender has at any time been convicted of any felony or misdemeanor offense under this chapter or under any statute of the United States or of any state relating to controlled substances or controlled substance analogs, narcotic drugs, marijuana or depressant, stimulant or hallucinogenic drugs.
(5) This section does not apply if the person is presently charged with a felony under s. 961.41 (3g) (c), (d), (e), or (g).