Wis. Stat. § 970.038
This section is constitutional. The scope of preliminary examinations is limited to determining whether there is probable cause to believe that a defendant has committed a felony. There is no constitutional right to confrontation at a preliminary examination. Further, due to the limited scope of preliminary examinations, the admission of hearsay evidence does not violate petitioners' rights to compulsory process, effective assistance of counsel, or due process. State v. O'Brien, 2014 WI 54, 354 Wis. 2d 753, 850 N.W.2d 8, 12-1769. Application of this section, which first became effective after the date of the alleged offense, did not constitute an ex post facto violation because it affects only the evidence that may be admitted at the preliminary hearing and does not alter the quantum or nature of evidence necessary to convict the defendant. State v. Hull, 2015 WI App 46, 363 Wis. 2d 603, 867 N.W.2d 419, 14-0365.