Search warrants seek evidence of drug addiction in Michael Jackson

The warrants, signed by District Judge Timothy Williams and given to CNN by Las Vegas affiliate KTNV, say "there is probable cause to believe" that searches would uncover evidence at the Las Vegas home and office of Dr. Conrad Murray of excessive prescribing, prescribing to an addict, excess treatment or prescribing, unprofessional conduct, prescribing to or treating an addict and manslaughter.

They cite "probable cause to believe" that the premises contained "records, shipping orders, distribution lists, use records relating to the purchase, transfer ordering, delivery and storage of propofol (Diprivan)."

A source told CNN on Monday that the Texas-based cardiologist allegedly gave Jackson the anesthetic propofol -- commonly known by the brand name Diprivan -- in the 24 hours before he died.

A source involved in the investigation into Jackson's death has told CNN that investigators found numerous bottles of prescription drugs in his $100,000-a-month rented mansion in Holmby Hills, California. Video Watch report on the warrants »

The items taken from Murray's home included copies of his computer and cell phone hard drives. They were to be turned over to the Los Angeles Police Department, which is leading the investigation into Jackson's death last month at age 50.

Murray is the central focus of a federal investigation into the singer's death, a law enforcement official told CNN on Wednesday.

Authorities have subpoenaed the records of various doctors who have treated Jackson over the years, but "Dr. [Conrad] Murray is the only one we're looking at," the federal law enforcement official said.

The disclosures were among several developments Wednesday in a story that continues to gather steam more than a month after the death of the pop icon on June 25.