In November 2008, the CDFD said traces of Hemraj's blood were found in Krishna's bedding. The defence pointed this out when it received the copies of the report more than two years later. In a matter of a week in March 2011, the CDFD changed the story—the original report had a typographical error, it said, Hemraj's blood was not found on Krishna's pillow cover. Suddenly, there was no case against Krishna—and by the principle of exclusion, the case against the Talwar's became stronger. Package after package of critical evidence was opened before the court on Wednesday, and there were no CDFD seals on any of them. Stickers had been replaced by handwritten chits, cello-taped to envelopes that were not standard issue: who was responsible for all of this? http://www.sify.com/news/cdfd-scientist-s-cross-examination-raises-more-questions-news-columns-mmnaQ6bjgjj.html