The remand of alleged "Galant document" forger, Lt.-Col. (res.) Boaz Harpaz was extended by four days by Petah Tikva Magistrate's Court on Sunday.
Harpaz has refused investigators requests that he undergo a polygraph test.
Police believe that Harpaz may have had help in creating the false document, which sought to implicate Maj. Gen. Yoav Galant in a public relations campaign against other candidates for IDF chief-of-staff.