A former MI5 employee has been detained indefinitely at Broadmoor Hospital after being found not guilty by reason of insanity for allegedly leaking state secrets to a foreign power. Juan Joseph, 43, a former government IT contractor, faced four charges under the Official Secrets Act and the National Security Act, as well as a charge for possessing a bladed article.
The verdict follows a week-long trial at the Old Bailey in March, much of which was held behind closed doors to protect national security. The court heard that Joseph, who once held the highest level of security vetting, repeatedly attempted to transmit sensitive information to a foreign state and traveled overseas to facilitate meetings with their embassy.
Mr. Justice Hilliard, presiding over the case, ruled that Joseph had been diagnosed with paranoid schizophrenia and did not possess a “guilty mind” or understand that his actions were wrong. Under sections 37 and 41 of the Mental Health Act, Joseph is now subject to a restricted hospital order, meaning his release is contingent upon the permission of the Ministry of Justice.
A Descent into Paranoia and Espionage
The court established a stark contrast between Joseph’s professional standing and his eventual mental collapse. For 11 years, Joseph served as a systems engineer, security IT management engineer, and senior support engineer at MI5, operating with top-tier clearance. However, his tenure ended abruptly in October 2020.
Joseph Hospital Security
Colleagues described Joseph as displaying “mental fragility,” “extreme anxiety,” and “paranoia” leading up to his termination. He had been taken to St Thomas’s Hospital in London but discharged himself before a full assessment could be completed. During his termination meeting, Joseph claimed he had been “victimised” and “gaslit” by the agency.
A witness earlier told the trial at the Old Bailey that Juan Joseph felt he had been ‘treated poorly’ (PA Archive)
Following his exit from Thames House, MI5’s headquarters, Joseph began making a series of unfounded and disturbing claims. He alleged he had been the victim of racist treatment and claimed to have suffered rape, child abuse, and torture. He further asserted that a swastika had been displayed in his office and that he had been injected with an unknown substance via a hypodermic needle.
Timeline of the Security Breach
The path toward Joseph’s arrest began in 2024, after a private prosecution for assault—stemming from a 2019 incident—was rejected. While pursuing a judicial review in the High Court, Joseph began copying an email address linked to a foreign state into his correspondence.
Key Events Leading to Arrest of Juan Joseph
Date
Event
Dec 8, 2024
Travels to Riga, Latvia; emails foreign embassy requesting meetings.
Dec 15, 2024
Detained at Gatwick Airport; refuses to provide codes for seven devices.
Jan 13, 2025
Emails foreign state complaining about police treatment at Gatwick.
Jan 30, 2025
Arrested at Ibis Hotel; found with lock knife and fake MI5 ID.
Upon his arrest at an Ibis Hotel on January 30, 2025, Joseph maintained he was an “armed MI5 officer.” Police discovered a lock knife in his pocket and a homemade identification card at his home in Sutton, south London, which falsely identified him as an active agent of the agency.
The court heard that Juan Joseph visited Latvia and attempted to arrange a meeting at the embassy of a foreign power (PA Archive)
During police interviews, Joseph characterized himself as a “whistleblower,” claiming he had passed polygraph tests. He further alleged he was a black belt in taekwondo and had received “ninja-style” knife and sword training at Thames House, asserting that he was permitted to carry a blade for self-defense.
National Security and Mental Health Risk
The legal outcome reflects a complex intersection of mental health and national security. While four psychiatrists agreed that Joseph should be given a restricted hospital order, the prosecution emphasized the danger posed by his instability. Ms. Jocelyn Ledward KC warned that if Joseph were to become unwell again, there is a “high risk” he would repeat his attempts to disclose sensitive information.
Joseph Justice Hospital
Dr. Michael Kavuma informed the court that Joseph is in the early stages of treatment and does not yet grasp the “seriousness of his actions” or the risk he poses. This lack of insight contributed to the judge’s decision to impose a Section 41 restriction, allowing for immediate recall to the hospital if his condition deteriorates.
“I accept that Mr Joseph would not have done what he did if he had not been mentally ill,” Mr Justice Hilliard said. “But if his particular mental illness is not treated effectively and his condition deteriorates, I am sure that there is a highly obvious risk that similar conduct could be repeated and the consequences for national security and for particular individuals could be very serious indeed.”
Joseph Juan Juan Joseph
The prosecution also revealed a missed opportunity for intervention: Joseph had been arrested on similar charges in early 2022. At the time, no further action was taken. Although he was admitted for a mental health assessment at the end of 2022, he was found not to be “sufficiently unwell” to remain in hospital at that time.
Disclaimer: This article reports on legal proceedings involving mental health diagnoses and psychiatric detention. This proves provided for informational purposes and does not constitute medical or legal advice.
Juan Joseph will remain at Broadmoor Hospital indefinitely. His status will be monitored by medical professionals and the Ministry of Justice, with any potential release requiring stringent government approval.
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