Wis. Stat. § 906.09
This section applies to both civil and criminal actions. When a plaintiff was asked by his own attorney whether he had ever been convicted of a crime, he could be asked on cross-examination as to the number of times. Underwood v. Strasser, 48 Wis. 2d 568, 180 N.W.2d 631 (1970). It was not error to give an instruction as to prior convictions effect on credibility when the prior case was a misdemeanor. McKissick v. State, 49 Wis. 2d 537, 182 N.W.2d 282 (1971). When a defendant's answers on direct examination with respect to the number of his prior convictions were inaccurate or incomplete, the correct and complete facts could be brought out on cross-examination, during which it was permissible to mention the crime by name in order to insure that the witness understood the particular conviction being referred to. Nicholas v. State, 49 Wis. 2d 683, 183 N.W.2d 11 (1971). Proffered evidence that a witness had been convicted of drinking offenses 18 times in the last 19 years could be rejected as immaterial if the evidence did not affect his credibility. Barren v. State, 55 Wis. 2d 460, 198 N.W.2d 345 (1972). When a witness truthfully acknowledges a prior conviction, inquiry into the nature of the conviction may not be made. Voith v. Buser, 83 Wis. 2d 540, 266 N.W.2d 304 (1978). A defendant's two prior convictions for burglary were admissible to prove intent to use gloves, a long pocket knife, a crowbar, and a pillow case as burglarious tools. Vanlue v. State, 96 Wis. 2d 81, 291 N.W.2d 467 (1980). Cross-examination on prior convictions without the trial court's threshold determination under sub. (3) was prejudicial. Gyrion v. Bauer, 132 Wis. 2d 434, 393 N.W.2d 107 (Ct. App. 1986). An accepted guilty plea constitutes a "conviction" for purposes of impeachment under sub. (1). State v. Trudeau, 157 Wis. 2d 51, 458 N.W.2d 383 (Ct. App. 1990). An expunged conviction is not admissible to attack witness credibility. State v. Anderson, 160 Wis. 2d 435, 466 N.W.2d 681 (Ct. App. 1991). Whether to admit evidence of prior convictions for impeachment purposes requires consideration of: 1) the lapse of time since the conviction; 2) the rehabilitation of the person convicted; 3) the gravity of the crime; and 4) the involvement of dishonesty in the crime. If allowed, the existence and number of convictions may be admitted, but the nature of the convictions may not be discussed. State v. Smith, 203 Wis. 2d 288, 553 N.W.2d 824 (Ct. App. 1996), 94-3350. Evidence that exposed a witness's prior life sentences and that he could suffer no penal consequences from confessing to the crime in question was properly admitted. State v. Scott, 2000 WI App 51, 234 Wis. 2d 129, 608 N.W.2d 753, 98-3105. Even if the circuit court did not expressly state on the record that it considered the possible danger of unfair prejudice, the fact that the court gave a limiting instruction can reveal that the trial court considered the possibly prejudicial nature of evidence and was seeking to ensure that it was properly utilized by the jury in reaching its verdict. State v. Gary M.B., 2004 WI 33, 270 Wis. 2d 62, 676 N.W.2d 475, 01-3393. Neither Seen nor Heard: Impeachment by Prior Conviction and the Continued Failure of the Wisconsin Rule to Protect the Criminal Defendant-Witness. Straka. 2018 WLR 1193.