Post-mortem tests on Michael Jackson are complete but the results are being kept under wraps until a police probe into his death is finished.
Toxicology tests have now been concluded but Los Angeles coroner Ed Winter has declined to say when they will be announced.
It is expected the tests will conclude Jackson was on heavy medication when he died.
The police investigation recently focused around Conrad Murray Jacksons personal doctor with police raiding his premises.
Dr Murray was said to have co-operated with officers in the searches last month, which resulted in the seizure of items including various medications and computer hard drives.
He has not been named as a suspect, but court records have confirmed him as a subject in the manslaughter investigation of Jackson, who died suddenly on 25 June.
Meanwhile, a plan to release a film based on the singer's last rehearsals in Los Angeles for his series of concerts at the O2 arena in London has been approved by a Los Angeles judge.
The proposal had been the subject of numerous objections by Jackson's mother Katherine, including concerns that his three children would appear in the movie.
The film is due to be released in October, with the singer's estate expected to receive about 90% of the proceeds.
The release is expected to be shown in 3D and will also include interviews with Jackson's friends and collaborators.
Michael Lynton, head of Sony Pictures Entertainment, said: "This historic recording of the last time he sang and danced on stage shows the legendary artist in an incredibly powerful way, with crystal clear images and sound."
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