In 1980, Otto Frank sued two Germans, Ernst Romer and Edgar Geiss, for distributing literature denouncing the diary as a forgery. The trial produced a study by official German state forensic bureau, the Bundes Kriminal Amt [BKA] forensically examined the manuscript, which at that point in time consisted of three hardbound notebooks and 324 loose pages bound in a fourth notebook, with special forensic equipment. In the end, BKA clearly determined that none of the diary handwriting matched known examples of Anne's handwriting. The bureau determined that everything in the diary was written by the same person. The person that wrote the diaries had used a ballpoint pen throughout. Unfortunately for Herr Frank, the ballpoint pen was not available until 1951 whereas Anne was known to have died of typhus in 1944.
The German magazine, Der Spiegel, published an account of this report stating that;-
(a) some editing postdated 1951;
(b) Experts had held that all the writing in the journal was by the same hand; and thus –
(c) the entire diary was a postwar fake.