instead, they argued, there was a marriage between kainat and one of the accused rapists, ahsan thebo. their evidence-- a marriage certificate, photographs, and a story of a love affair. >> narrator: we asked kainat about the photos. she said she didn't remember having her picture taken with ahsan. >> as far as the photographs are concerned, you just can't look at them and say, "oh, i see these are two happy people. okay. there is no rape." you can't do that. there is a procedure laid down in law of how those photographs are really proved. that was not followed. >> narrator: he presented this argument at the trial, saying that the negatives of the photos were never presented. but there was also the marriage certificate. we asked him how kainat's fingerprints and signature got onto the document. >> siddiqi: she says that, "i signed some documents." she vaguely recalls that she was in some courtroom. >> siddiqi: defense of marriage is a very common defense. because that is the usual practice, is that you rape a woman in the night or gang rape her, and then force her to get married so th