A former MI5 IT contractor has been found “not guilty by reason of insanity” by an Vintage Bailey jury after disclosing intelligence information to a “foreign power.” The case, which involved classified evidence presented in closed sessions, highlights the complex intersection of national security and mental health.
Details of the Case
Juan Joseph, 43, worked for the Security Service – commonly known as MI5 – from 2009 until 2020, holding positions including systems engineer and security IT management engineer. He possessed the highest level of security clearance, “Developed Vetting,” granting him access to “information of the highest classification.”
The court heard that Joseph began experiencing mental health issues in 2020. Following the termination of his contract, he repeatedly raised unfounded grievances against MI5, including claims of racism, rape, child abuse and torture. In August 2024, he attempted to bring a private prosecution against the agency for an alleged assault.
The disclosures of intelligence began after Joseph’s attempt at a judicial review was rejected. He then emailed an address associated with the foreign state. In December 2024, he traveled to Riga, Latvia, via Air Baltic, where he emailed the foreign embassy and requested a meeting. Further communication occurred in January 2025.
Upon his arrest on January 30, 2025, at a hotel in Sutton, police found a folding lock knife in his possession. Joseph claimed he was authorized to carry it due to his “ongoing role as an MI5 officer” and presented a fake ID card identifying him as a “STRAP officer.”
The Verdict and Aftermath
The prosecution and defense did not dispute the evidence of the intelligence disclosures or Joseph’s diagnosis of schizophrenia. Three psychiatrists testified to his mental state, and Mr. Justice Hilliard explained to the jury that the psychiatrists agreed Joseph “did not think that he was doing anything wrong,” believing he was “justified in what he was doing.” After less than two and a half hours of deliberation, the jury found Joseph not guilty by reason of insanity on all five charges, including two under the Official Secrets Act and two under the National Security Act.
Joseph will continue to receive mental health treatment at Broadmoor Hospital. A further court date is scheduled for April 15.
Frequently Asked Questions
What information was disclosed to the foreign power?
The name of the country and the specific information disclosed have been kept secret from the press and public to avoid damaging national security. The jury heard this evidence in closed sessions and were instructed not to discuss it with anyone.
What was Juan Joseph’s role at MI5?
Juan Joseph worked as an IT contractor for MI5 from 2009 to 2020, holding positions as systems engineer, security IT management engineer, and senior support engineer. He had the highest level of security clearance, allowing him access to highly classified information.
What will happen to Juan Joseph now?
Juan Joseph will continue to receive mental health treatment at Broadmoor Hospital. His case will be reviewed in court again on April 15.
Given the sensitive nature of this case and the ongoing need to protect national security, how might intelligence agencies adapt their vetting and support processes for personnel in the future?
