Casement's Congo Diary, one of the so-called "Black Diaries", was not a forgery.

Casement's so-called Black Diaries were used by the British Government to prejudice the chances of a reprieve because they gave evidence of homosexual behaviour during at least nine years. A chronology of the Forgery Controversy is listed. Five arguments taken together prove that his Congo Diary of 1903-1904 is genuine: the graphology, the textual analysis, XRay proof, the lack of sources to forge at least 50 entries (a main argument) and a nonpublished autobiography of Harris.