The Bergen County Prosecutor’s Office, accused in a civil suit of blowing the cover of confidential informant Frank Lagano, has lost its bid to compel testimony of the lawyer for a detective who induced Lagano to become an informant.

The prosecutors, in Estate of Lagano v. Bergen County Prosecutor’s Office, sought to pierce attorney-client privilege and compel testimony from Robert Tandy, a Woodcliff Lake attorney who represented James Sweeney. The suit on behalf of Lagano’s estate claims the failure by the prosecutor’s office to protect Lagano’s status as an informant from disclosure was the proximate cause of his death.