Police have searched the Las Vegas home and offices of Michael Jackson's doctor as part of a manslaughter investigation¹ into the singer's death.

警方已经搜查了杰克逊私人医生在拉斯维加斯的家和办公室，这是过失杀人调查的一部分工作。

Dr Murray has already been interviewed twice by police

Dr Conrad Murray's lawyer, Edward Chernoff, said officials were looking for the star's medical records.

The search is the second in a week following a similar operation at the doctor's Houston clinic on 22 July.

Dr Murray, who was with Jackson and tried to revive（使酒醒） him before he died, has not been named as a suspect.

In a statement, Dr Murray's lawyer Edward Chernoff said the warrant "authorised investigators² to look for medical records relating to Michael Jackson and all of his reported aliases³".

He added Dr Murray was present during the search of his home and assisted the officers, who seized mobile phones and a computer hard drive.

Toxicology results

Reports suggest the investigation around Jackson's death is focusing on his use of powerful painkilling⁴ drugs.

The Drug Enforcement Administration has been involved in the investigation because the agency licenses⁵ doctors to administer controlled pharmaceuticals⁶（医药品）.

Searches at the clinic and another site rented by Dr Murray in Houston, Texas, were carried out last Wednesday after a warrant was issued by a judge in the city.

The warrant, filed in Harris County District Court, said authorities were looking for "items constituting evidence of the offence of manslaughter that tend to show that Dr Conrad Murray committed the said criminal offence".

Such charges against a doctor for the death of a patient are extremely rare and require authorities to show there was a reckless（鲁莽的） action that created a risk of death.

Items seized during the searches included 27 tablets of the weight loss drug Phentermine, a tablet of the muscle relaxant Clonazepam, two hard drives, notices from the Internal Revenue Service and a registration⁷ for controlled substances.

Police have said Dr Murray is co-operating in the investigation.

Paramedics（护理人员） were called to Jackson's Los Angeles mansion⁸ while Dr Murray was performing CPR on the singer on the day he died, according to a recording⁹ of a 911 call.

Speaking a few days after Jackson's 25 June death, Mr Chernoff, denied his client administered painkilling drugs that could have contributed to the singer's death.

An official determination of what killed Jackson will not be made until the results of a toxicology（毒物学） report are disclosed.