It doesn’t work at DCSA Personal Appearances. It works at DOHA hearings and at other agency hearings where they generally follow the Federal Rules of Evidence. To be completely accurate, an investigative report can be entered as evidence at a DOHA hearing over the objection of an applicant if the government presents it with an authenticating witness (the investigator). However, investigators have not appeared at DOHA hearings since 2005 when OPM took over DoD security clearance investigations. Even after the investigations returned to DoD (DCSA), investigators are still not called to testify at DOHA hearing. This is probably because there are so many contract investigators and there is no mechanism for compensating them for their time. Attachments (e.g. arrest reports, credit reports, rental records, etc.) to investigative reports are always admissible at DOHA hearings.