Prosecutors in the trial of Michael Jackson's doctor want to block testimony relating to claims that the late singer molested children.

Lawyers have asked Judge Michael Pastor to bar Steve Robel - a key investigator in the 2005 allegations against the 'Thriller' hitmaker - from testifying as a defence witness for Dr. Conrad Murray, who is accused of the involuntary manslaughter of the star.

Prosecutors believe any testimony referring to the allegations against Michael could inflame the jury and insist they are not relevant to the current case, which sees the medic accused of administering the fateful dose of Propofol which killed the singer in June 2009.

According to gossip website TMZ, the prosecution have also asked the judge to block testimony from a number of doctors who treated the King of Pop but were not involved in his care on the day of his death.

It has previously been claimed that lawyers for the defence had nine medical professionals lined up to speak about Michael's drug use - with their proposed argument to be that the singer was addicted to prescription medication, resulting in the condition the 'Billie Jean' star was in when he died.

Judge Pastor has not ruled on the motions.

However, he has rejected the application by the defence team to have the jury sequestered because he doesn't want them to feel "like inmates".

To ensure they are protected from harassment or outside influence, jurors will be given meals and snacks in the jury room, rather than in areas accessible by the media or the public.

The judge insisted the decision was not financial, but he felt confident sufficient measures will be in place to prevent the jury from being contaminated.

Dr. Murray's legal team had filed documents requesting the jury be sequestered as they feared they could be subject to "large-scale character assassinations" in the media.