Graves has testified as an expert witness on national security/homeland security and transparency issues before both the U.S. Senate and the House of Representatives.
Amathuna afakaze njengofakazi oyingcweti ezindabeni zokuphepha / ukuphepha kwezwe kanye nezindaba ezibonisa obala phambi kweSenate yase-US kanye neNdlu yabaMamele.