Law enforcement agencies will be required to make video or audiotapes whenever they interrogate a felony suspect beginning January first.
Task force members who helped craft the law say it could have a sweeping effect on trials in Wisconsin.
Currently, videotapes of suspects' statements are rarely seen in Wisconsin courtrooms. But criminal justice experts say they will become more prevalent.
La Crosse County District Attorney Scott Horne served on the state task force that helped shape the law. Horne says it will benefit judges and juries because it resolves ambiguities about what questions were asked and what answers were given.
The law comes from the so-called Avery Task Force, formed to look at a variety of criminal procedures after Steven Avery served more than 17 years in prison for a rape committed by someone else.