Matthew S. Pleisse

Introduction

Matthew S. Pleisse is a former detective with the Shippensburg Police Department in Shippensburg, Pennsylvania, who pleaded guilty in federal court to possession of child pornography involving a prepubescent minor. Pleisse, 36, entered his plea on October 19, 2026, before United States District Judge Robert D. Mariani in the Middle District of Pennsylvania, and the United States Attorney’s Office for that district announced it the following day. Under the terms of his plea agreement, Pleisse is required to resign from the Shippensburg Police Department within ten days and is barred from seeking or accepting a position of public trust. He faces up to twenty years in prison when he is sentenced.

Background Information

Pleisse worked as a detective for the Shippensburg Police Department, a municipal law-enforcement agency serving the Shippensburg, Pennsylvania community. Details about the length of his law-enforcement career and his specific assignments were not included in the U.S. Attorney’s Office announcement. The federal case against him was investigated by Homeland Security Investigations and prosecuted by Assistant United States Attorney Stephen W. Dukes. The case was brought as part of Project Safe Childhood, a nationwide Department of Justice initiative launched in May 2006 to combat child sexual exploitation and abuse, which marshals federal, state, and local resources to locate, apprehend, and prosecute individuals who exploit children via the internet and to identify and rescue victims.

The Controversy or Incident That Led to Their Cancellation

Pleaded guilty. Matthew S. Pleisse pleaded guilty before Judge Robert D. Mariani on October 19, 2026, to possession of child pornography involving a prepubescent minor. The plea is a court-record finding of guilt; his sentencing was pending as of the announcement, and no sentencing date had been reported in the source release.

According to the announcement by United States Attorney Brian D. Miller, in April 2025 law enforcement executed a search warrant at Pleisse’s residence in Shippensburg. Officers seized several electronic devices from the home, including his personal computer and his cell phone. Both devices were then forensically analyzed as part of the investigation.

Prosecutors stated that the forensic analysis established two things: that Pleisse had utilized cryptocurrency to purchase child pornography from the darkweb, and that he possessed child pornography depicting prepubescent minors. The offense to which he later pleaded guilty — possession of child pornography — specifically involved a prepubescent minor. These findings were presented through the U.S. Attorney’s Office and formed the factual basis of the federal case against him.

On October 19, 2026, Pleisse appeared before Judge Robert D. Mariani of the United States District Court for the Middle District of Pennsylvania and pleaded guilty to that charge. A guilty plea entered in federal court is an admission of the offense charged, and it constitutes a conviction on the court’s record. The U.S. Attorney’s Office announced the plea publicly in a press release dated Tuesday, October 20, 2026.

The plea agreement carried conditions that reached directly into his employment. As part of the agreement, Pleisse is required to resign from his position with the Shippensburg Police Department within ten days, and he is required not to seek or accept a position of public trust as a condition of his supervised release. In other words, even before a sentence is imposed, the plea itself ends his career in policing and restricts the kind of work he may hold in the future.

Regarding penalty exposure, Pleisse faces a maximum sentence of 20 years’ imprisonment, a term of supervised release following imprisonment, and a fine. The announcement noted that a sentence following the finding of guilt is imposed by the judge after consideration of the applicable federal sentencing statutes and the Federal Sentencing Guidelines. The case was investigated by Homeland Security Investigations, with Assistant United States Attorney Stephen W. Dukes prosecuting, and was brought under the Justice Department’s Project Safe Childhood initiative.

Public Reaction and Consequences

The U.S. Attorney’s Office announcement did not include public statements, community reactions, or commentary from the Shippensburg Police Department itself, so no public response was recorded in the source material. What the announcement did record was the concrete consequence set in motion by the plea: a sitting police detective, an officer charged with enforcing the law, had admitted in federal court to possessing child pornography involving a prepubescent minor. The case was publicly announced through a press release posted to the Justice Department’s website as part of its Project Safe Childhood docket, placing the details of the plea — the April 2025 search, the darkweb purchases made with cryptocurrency, and the required resignation — into the public record.

Current Status

As of the October 20, 2026 announcement, Pleisse had pleaded guilty and his conviction was on the court’s record, but he had not yet been sentenced. Sentencing remains pending before Judge Robert D. Mariani, and no sentencing date was reported in the release. At sentencing he faces a maximum of 20 years’ imprisonment, a term of supervised release, and a fine, with the final sentence to be determined under the federal sentencing statutes and the advisory Federal Sentencing Guidelines. Under his plea agreement, he was required to resign from the Shippensburg Police Department within ten days of the plea, and he is required not to seek or accept a position of public trust as a condition of his supervised release. His custody status pending sentencing was not addressed in the announcement.

Impact on Their Career/Life

The guilty plea effectively ended Pleisse’s law-enforcement career. The resignation from the Shippensburg Police Department was not a discretionary employment decision left to the department — it was written into the federal plea agreement, with a ten-day deadline attached. The additional condition barring him from seeking or accepting any position of public trust forecloses future government employment as a term of his supervised release. Beyond the career consequences, he faces up to 20 years in prison, a period of supervised release, and a fine at his pending sentencing.

Sources

• U.S. Attorney’s Office for the Middle District of Pennsylvania, “Shippensburg Detective Pleads Guilty to Possession of Child Pornography,” published October 20, 2026 — source