(1) In this section:
(a) “Firearm violation” means any of the following: 1. A violation of s. 941.29 or 941.2905. 2. A commission of any crime specified under chs. 939 to 951 and 961 if the person uses a firearm in the commission of the crime.
(b) “Repeater” has the meaning given in s. 939.62 (2).
(2) If a person who is a repeater is convicted of a firearm violation, the court shall impose a bifurcated sentence under s. 973.01. Notwithstanding s. 973.01 (2) (b), the term of confinement in prison portion of the bifurcated sentence shall be at least 4 years, but otherwise the penalties for the crime apply, subject to any applicable penalty enhancement. The court may not place the person on probation.
(3) This section does not apply to sentences imposed after July 1, 2022.
(4) The department of justice shall, after consulting with persons the department determines to be appropriate, including the city of Milwaukee and the Milwaukee police department, prepare a report on the efficacy of the mandatory minimum sentence under this section. No later than August 1, 2022, the department of justice shall submit the report to the chief clerk of each house of the legislature, for distribution to the legislature under s. 13.172 (2).