Sources tell TMZ ... Michael cajoled a Las Vegas dentist into performing a procedure on Blanket in July, 2008, that involved putting the boy under anesthesia for 2 hours in a dental office that did not have the necessary permit for anesthesia.
TMZ has obtained internal documents from the Nevada Board of Dental Examiners, which detail Michael Jackson's interactions with Dr. Mark Tadrissi. According to the documents, Tadrissi told Michael he couldn't perform the procedure on Blanket because he lacked the permit.
According to the Board's investigator, Michael didn't want to hear about permits and told the doctor, "Have an anesthesiologist do whatever type of sedation required."
Tadrissi capitulated and performed the 2 hour procedure on Blanket ... who was 6 years old at the time. An anesthesiologist had Blanket sedated the entire time.
Now here's where it gets mysterious. The Board -- which learned of Tadrissi's actions after Michael died -- initiated a disciplinary action against Tadrissi for allowing Blanket to be anesthetized in his office. The Board also went after Dr. Tadrissi for allowing Michael to receive Propofol in his office, without the proper permit.
Dr. Tadrissi struck a deal with the Board in 2010 in which he was sanctioned. In a draft of the report, the Board based the sanctions on his treatment of both Blanket and Michael. But in the final version of the report Blanket was taken completely out -- there is no mention of the boy or his treatment.
One source connected with the investigation tells TMZ ... pressure was put on the Board to omit Blanket from the report, and when the final version was issued, the discipline was based solely on Michael's treatment.