LOS ANGELES , California -LRB- CNN -RRB- -- While authorities do not yet know what killed Michael Jackson , the possibility that anesthetics -- particularly the drug Diprivan -- might be involved continues to swell with each new revelation . Propofol induces a coma , not sleep , an anesthesiologist told CNN . On Friday , The Associated Press quoted an unnamed law enforcement source saying investigators found Diprivan in Jackson 's Holmby Hills home . A nutritionist , Cherilyn Lee , said earlier in the week that Jackson pleaded for the drug despite being told of its harmful effects . Sources close to Jackson told CNN 's Dr. Sanjay Gupta that the singer , who suffered from a sleep disorder , traveled with an anesthesiologist who would `` take him down '' at night and `` bring him back up '' during a world tour in the mid-90s . The California State Attorney General 's office has now said it is helping the Los Angeles Police Department in Jackson 's death investigation . The U.S. Drug Enforcement Administration is also looking into the role of drugs , two federal law enforcement sources said . The drug Diprivan , known by its generic name Propofol , is administered intravenously in operating rooms as a general anesthetic , the manufacturer AstraZeneca said Friday . `` It is neither indicated nor approved for use as a sleep aid , '' said spokesman Tony Jewell . The drug works as a depressant on one 's central nervous system . `` It works on your brain , '' said Dr. Zeev Kain , the chair of the anesthesiology department at the University of California Irvine . `` It basically puts the entire brain to sleep . '' However , once the infusion is stopped , the patient wakes up almost immediately . `` So if you 're going to do this , you 'd have to have somebody right there giving you the medication and monitoring you continuously , '' Kain said . Dr. Hector Vila , chairman of the Ambulatory Surgery Committee for the American Society of Anesthesiologists , said he administers the drug during office procedures such as urology , dentistry and gynecology . It is also the most common anesthetic for colonoscopies , he said . Both doctors said that while they have heard of the drug being abused by health care professionals , who have ready access to it , they had not heard of it being used as a sleep aid medication . `` Propofol induces coma , it does not induce sleep , '' Kain said . `` I can put you in a coma for as many days as you want . And , in fact , in intensive care units who have patients who are on a ventilator , that 's one of the drugs they use . '' Dr. Rakesh Marwah , of the anesthesiology department at the Stanford University School of Medicine , said the drug can lead to cardiac arrest without proper monitoring . `` Propofol slows down the heart rate and slows down the respiratory rate and slows down the vital functions of the body , '' he said . Not enough carbon dioxide exits the body ; not enough oxygen enters . And the situation can cause the heart to abruptly stop . '' -LSB- It is -RSB- as dangerous as it comes , '' Kain said . `` You will die if you will give yourself , or if somebody will give you , Propofol and you 're not in the proper medical hands . '' Los Angeles police have interviewed Jackson 's cardiologist , Dr. Conrad Murray , who apparently tried to revive the singer after he was found unconscious on June 25 . They also impounded Murray 's car , saying it might contain evidence -- possibly prescription medications . Police did not say whether they found anything . Through his lawyers , Murray has released several statements saying that he would not be commenting until the toxicology results into Jackson 's death are released . The tests are due back in two to three weeks , the Los Angeles County coroner said Thursday . `` We are treating all unnamed sources as rumors . And , as we have stated before , we will not be responding to rumors or innuendo , '' Murray 's lawyer , Matt Alford said Friday . `` We are awaiting the facts to come out and we will respond at that time . '' The anesthesiologist who accompanied Jackson during the HIStory tour in the mid - '90s also refused to comment , although he acknowledged Jackson suffered from a sleep disorder . `` I 'm very upset . I 'm distraught . Michael was a good person . I ca n't talk about it right now , '' Dr. Neil Ratner said outside his Woodstock , New York , home Thursday . `` It 's really something I do n't want to talk about right now . I lost a good friend . '' On Thursday , the California State Attorney General 's Office said it will assist Los Angeles police in sifting through information in a state database that monitors controlled medication . The database , known as CURES -LRB- Controlled Substance Utilization Review and Evaluation System -RRB- , contains an estimated 86 million records that list all doctors who prescribe such medication , the amount , the date and the person who receives it . Authorities said the database was used in the investigation after the death of former model and reality TV show star Anna Nicole Smith . A day earlier , federal law enforcement sources said DEA agents would be looking at various doctors involved with Jackson , their practices and their possible sources of medicine supply . A number of people close to Jackson have expressed concern that medication could have contributed to the singer 's death at age 50 . In 2005 , after he was cleared on charges of child molestation , Jackson spent a week at a center run by Dr. Deepak Chopra , a physician who focuses on spirituality and the mind-body connection . During that week , Jackson asked Chopra for a prescription for a narcotic , the doctor said . `` I said , ` What the heck do you want a narcotic prescription for ? ' '' Chopra said . `` And it suddenly dawned on me that he was probably taking these and that he had probably a number of doctors who were giving him these prescriptions , so I confronted him with that . At first , he denied it . Then , he said he was in a lot of pain . '' Brian Oxman , a former attorney for the Jackson family who was with the family in the hospital emergency room on June 25 , also expressed concern about medications the pop star was taking . `` I talked to his family about it , I warned them -- I said that Michael is overmedicating and that I did not want to see this kind of a case develop , '' Oxman told CNN the next day . Earlier this week , the nutritionist Lee , a registered nurse , said Jackson suffered from severe bouts of insomnia and asked her to find him some Diprivan . `` I told him this medication is not safe , '' Lee said . `` He said , ' I just want to get some sleep . You do n't understand . I just want to be able to be knocked out and go to sleep . ' '' Lee , however , said she did not know of any doctors who would have given Jackson the drug nor had she seen him use it . CNN 's Danielle Dellorto and Elizabeth Landau in Atlanta , Georgia , and Drew Griffin in Los Angeles , California , contributed to this report .