On Point blog, page 4 of 4
Knowing possession of trace heroin imputed from track marks and paraphernalia
State v. Nakyta V.T. Chentis, 2022 WI App 4; case activity (including briefs)
To convict someone of possession of a controlled substance, the State must prove both that he was in possession of the substance and that he knew or believed he was in possession of it. State v. Christel, 61 Wis. 2d 143, 159, 211 N.W.2d 801 (1973). See also Wis JI-Criminal 6000. In a published opinion, the court of appeals holds Chentis knew he possessed a trace amount of heroin–undetectable until the State Crime Lab applied a special chemical to paraphernalia–based on fresh track marks on his arm.