LOS ANGELES, California (CNN) -- Search warrants filed Thursday in court in Clark County, Nevada, and carried out at properties of Michael Jackson's doctor imply that investigators looking into his death believe the singer was a drug addict.



Dr. Conrad Murray was with Michael Jackson on the day that he died.



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.  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.



Other recent developments:



• Jackson's father, Joe, acknowledged that a 25-year-old Norwegian performer is Jackson's son -- even as the man himself denied the relationship in various news reports.



• Jackson's estate is worth at least $200 million, a source with knowledge of the estate's dealings told CNN.



Murray and the drug investigation



Despite the comment from the federal law enforcement official, Murray's lawyer does not think an arrest is imminent because autopsy results into Jackson's death are pending.



Police have interviewed Murray twice since Jackson's death. Murray's lawyer, Ed Chernoff, said his client is ready to talk to investigators again, but a meeting has not been scheduled.



Murray has consistently denied he prescribed or administered anything that could have killed Jackson.  Watch a profile of Murray »



On Tuesday, investigators searched Murray's home and office in Las Vegas, Nevada.



Chernoff said he won't comment on "rumors, innuendo or unnamed sources."  Watch CNN's Ted Rowlands report on drug allegation »



Meanwhile, Murray failed to make a payment of $15,000 on his $1.65 million home in January and has racked up debt since.



If he does not make a payment by mid-August, he will lose his home to foreclosure, a spokeswoman confirmed.



"He was to be paid $150,000 a month by Michael Jackson," the spokeswoman said. "He was not [paid] by AEG, the tour promoter, or Jackson, for the two months he worked for them. So he's low on money."



Murray has been beset by financial difficulties since graduating from medical school.



He filed for Chapter 7 bankruptcy protection in 1992 and accumulated $44,663 in state tax liens in Arizona and California from 1993 until 2003, according to court documents.



He has also has been hit with several judgments related to unpaid bills, child support payments and defaults on education loans.



On Wednesday, CNN learned Murray was arrested on a charge of domestic violence disorderly conduct in Tucson, Arizona,
What kind of evidence was there? What was found in his home? Who's responsible for Jacksons death? What is Dr Conrad Murray famous for? What is the doctors name? What is Singer's first name?
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)." numerous bottles of prescription drugs Dr. Conrad Murray was with Michael Jackson on the day that he died. Dr. Conrad Murray Michael
question: What kind of evidence was there?, answer: 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)." | question: What was found in his home?, answer: numerous bottles of prescription drugs | question: Who's responsible for Jacksons death?, answer: Dr. Conrad Murray | question: What is Dr Conrad Murray famous for?, answer: was with Michael Jackson on the day that he died. | question: What is the doctors name?, answer: Dr. Conrad Murray | question: What is Singer's first name?, answer: Michael