Private detective Glenn Mulcaire is not protected under the UK’s equivalent to the Fifth Amendment, the Supreme Court said Wednesday. After a nearly two-year legal battle to avoid such disclosure, Mulcaire will have to turn over possibly self-incriminating evidence, the names of journalists at the News Of The World who allegedly instructed him to intercept voice messages, and how victims were allegedly targeted, according to The Guardian. The ruling stems from a breach of privacy suit brought against Mulcaire by Nicola Phillips, assistant to celebrity publicist Max Clifford. Phillips’ attorney Mark Lewis contends the decision establishes precedent. If so, it could impact the ongoing investigations into phone hacking at the defunct tabloid by potentially uncovering the extent of such practices and who was aware of them.

Mulcaire, along with former editor Clive Goodman, colloquially known as the “one rogue reporter,” went to prison in 2007 for hacking into the phones of the royal household. In that case, guilty pleas meant the court did not disclose whether hacking was rampant at the News Of The World or if other people were involved in ordering it besides Goodman, The Financial Times notes. News Corp, which owned News Of The World via its UK print arm News International, has already settled 60 of a potential 500 cases stemming from the scandal that broke open one year ago.