At Cook County Jail, seemingly ordinary sheets of paper have become a lethal smuggling tool. Investigators say tiny strips of mail soaked in powerful synthetic drugs were smoked by detainees, and in several fatal cases, burned scraps were found near the bodies. In response, the sheriff’s office has tightened mail and visitation rules, launched criminal probes and leaned on forensic labs to keep up with an ever-shifting mix of chemicals.
Forensic teams identify a dangerous synthetic
The Center for Forensic Science Research & Education, summarizing a case series from the American Journal of Forensic Medicine and Pathology, reports that postmortem testing tied to deaths at the jail found MDMB-4en-PINACA, a potent synthetic cannabinoid. Researchers wrote that “this case series suggests that even isolated use can potentially lead to death,” a warning that is now guiding local investigators and medical examiners as they comb through surveillance footage and autopsy results.
In a May 2024 press release, the Cook County Sheriff’s Office said a sharp rise in suspected overdoses in 2023 triggered expanded searches of housing units and incoming mail. Prosecutors have approved felony charges in multiple smuggling cases, and officials say the jail has charged dozens of people connected to drug-soaked paper while rolling out an internal public-health campaign to warn detainees about the risks. Sheriff’s staff also report that new chemical combinations seen in recent seizures are complicating how medical teams respond to emergencies inside the complex.
As reported by FOX 32 Chicago, lab testing showed some seized papers carried a cocktail of up to 10 different drugs, including synthetic cannabinoids, xylazine (an animal sedative) and potent nitazene-class opioids. “Any one of which could be fatal on its own,” Sheriff Tom Dart told FOX 32 after investigators received multi-drug test results. Forensic chemists say these mixtures, often manufactured overseas and blended locally, turn every puff into a gamble.
Where the paper is coming from
Federal prosecutors and local reporting have outlined schemes in which sellers spray or soak copy paper and envelopes with manufactured drugs, then mail or route them into correctional facilities. According to CBS News, a New York woman pleaded guilty in 2025 to making and mailing MDMB-4en-PINACA–laced documents to prisons, a case prosecutors say mirrors similar networks operating through the internet and social media.
Why naloxone can’t reverse the harm
Jail medical staff and the sheriff’s office caution that naloxone (Narcan), the familiar opioid overdose antidote, will not reliably reverse intoxication from synthetic cannabinoids or animal tranquilizers such as xylazine. In its public statement, the Cook County Sheriff’s Office warned, “Unlike opioids, synthetic cannabinoids and powerful animal tranquilizers such as xylazine cannot be reversed by naloxone.” That leaves corrections medics with limited tools when someone’s breathing crashes after smoking drug-treated pages.
How the jail is responding
Cook County has moved to restrict paper entering the facility, increase mail screening, and step up searches of housing units, while also expanding recovery-support services for detainees. Public television reporting notes that these measures have disrupted some educational and legal-paper routines. As detailed by WTTW/Chicago Tonight, advocates have pushed back on broad paper limits that can complicate the delivery of classroom materials and legitimate legal documents, and the jail later adjusted its rules to protect attorney-client mail…