Twinkiesmom, thank you for all your hard work. I didn't mean to send you on an extended search over such a trivial matter.
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Here's an actual New York State case where a mother went to court and prevented a widow from exhuming her late husband's body:
http://www.forchellilaw.com/cs07_1.html
If one of the Hances objected, the burden would be on Dan Schuler to convince a court that the exhumation was necessary. Given the testing and retesting already done, a court may not have agreed.
NOTE: THIS IS STILL JUST SPECULATION ON MY PART THAT THIS IS WHY DAN WAS UNABLE TO HAVE DIANE EXHUMED. I HAVEN'T FOUND A DIRECT EXPLANATION.
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Per this link, the Bastardis wanted the exhumation done so that additional testing could be done on Diane's hair to test for chronic alcohol usage:
http://www.topix.com/forum/nyc/TU72QFIDL50OG24MM
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It's weird. There are dozens of on-line sources announcing the pending exhumation, but I can't find a single one saying the exhumation was cancelled.
The Wiki entry says there was an uproar when it was announced the film company might pay for the exhumation, so maybe the doc makers backed off. (I doubt it.) The Wiki entry also mentions differing opinions as to whether the time passed since burial would affect tests such as BAC.