I wonder if the delay due to evidence has anything to do with the inquest into Daniel Smith's death - scheduled for 27 March 2007.
From 18 January 2007 article
http://www.9news.com/life/entertainment/article.aspx?storyid=63358
A formal inquiry into the death of Anna Nicole Smith's 20-year-old son has been scheduled for March 27 in the Bahamas, the chief magistrate said Tuesday.
Inside Edition, after reporting the delay in revealing ANS's cause of death and the reason for the delay made a point that the only person who had not/would not talk to Dr. Perper is Dr. Sandeep Kapoor.