New Illinois Law Strengthens Missing Persons Investigations (Cook County, IL) – Illinois will soon overhaul the way law enforcement handles missing persons cases under a new law championed by Cook County Sheriff Thomas J. Dart.
Governor JB Pritzker signed the Missing Persons Identification Act on Aug. 15. The law, sponsored by Sen. Michael Hastings (D-Frankfort) and Rep. Debbie Meyers-Martin (D-Matteson), will take effect Jan. 1, 2026.
The measure eliminates waiting periods for filing missing persons reports and requires police to immediately enter cases into the state’s Law Enforcement Agencies Data System (LEADS). Agencies will also be required to keep cases active until the individual is found, rather than closing them prematurely.
Other provisions direct police to collect and search fingerprint records, dental records, photographs, and other biometric data not only against local criminal databases but also across state and national systems. If someone remains missing for 60 days, their information must be added to the federal National Missing and Unidentified Persons System (NamUs).
Sheriff Dart said the reforms are informed by his department’s work reopening the investigation into the victims of serial killer John Wayne Gacy. When detectives revisited the case in 2011, they discovered that many missing persons records were incomplete or ignored.
“Too often, families were left waiting while cases were stalled or overlooked,” Dart said. “This law ensures every missing person’s case is treated with urgency and thoroughness from the start.”
In 2021, Dart launched the Missing Persons Project, a dedicated unit using advanced forensic and investigative tools to track down missing women. The unit has since closed more than 40 cases.
Advocates say the new law will bring Illinois in line with best practices nationwide and give families greater hope for answers in missing persons cases.
New Illinois Law Strengthens Missing Persons Investigations
