Wis. Stat. § 345.55: Traffic officers not to profit from arrests.

(1) No traffic officer shall demand, solicit, receive or be paid any remuneration upon the basis of number of arrests made, convictions obtained or amount of fines collected.

(2) Any person violating this section may be required to forfeit not less than $25 nor more than $200 for the first offense and, for the second and each subsequent conviction within one year thereafter, may be required to forfeit not less than $50 nor more than $500.