The East Bay Times reports the District Attorney's office has been trying to get the critical report for the past month from the fire department and the city attorney's office.
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PHOTOS: A look inside the Oakland Ghost Ship collective warehouse
Legal experts say the delay in handing the report over could violate the law.
That's because if the report is submitted for review a copy must be provided to the prosecuting agency for review.
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Thirty six people died of smoke inhalation in the December fire.
Investigators have not yet said what started the fire.
Click here for all ABC7 News stories, videos, and photos from the Ghost Ship warehouse fire.