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ABC News confirmed what many of Jackson's friends have been saying: He demanded drugs in excess of what he needed.
He was addicted.
In the hours before his death, Michael Jackson was injected with the drug Demerol. It is administered for acute pain, considered safer than morphine, but is highly restricted.
LAPD investigators found Demerol and another powerful drug Propofol in Jackson's Holmby Hills living quarters. It's used as an anesthetic for surgery.
Propofal is also known as Diprovan. It can only be administered intravenously and requires special order by a pharmacy. Accidental deaths are linked to it. Doses that are even slightly higher than recommended can reportedly stop a person's breathing.
ABC News has confirmation that Michael Jackson was addicted to OxyContin. It is used for severe pain disorders. It also has a mood altering effect that gets users hooked. Sources tell ABC News Jackson used it daily.
Investigators found other medications inside Jackson's home. There were reportedly multiple names on the bottled, and some were believed to be aliases.
However, according to federal sources, use of fake names may not be a crime.
LAPD is getting assistance from the DEA Diversion Division, which tracks pharmaceuticals that are used outside legal limits and black market sales.
State law enforcement officials are also assisting. It controls a database with the name of every that prescribes a controlled medicine, the name of the patient using the drug, the quantity and the date.
The DEA will be trying to find out more about the relationship of various doctors with Jackson. Did they examine him, talk to him, or did they write prescriptions simply at someone's request?
Dispensing medications without a face-to-face relationship can be illegal.
There are questions surrounding how the LAPD handled its investigation into Jackson's death.
There are reports that police did not immediately seal the mansion where Jackson was found dead or get immediate search warrants.
Some say police should have done a better job ensuring the scene and evidence were not tainted.
L.A. police defended their actions and said proper procedures were followed, but did not say if the department was reviewing its handling of the investigation.
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The memorial service has been set for 10 a.m. Tuesday to honor the King of Pop after he died June 25 at his rented estate in Holmby Hills.
The event will reportedly feature live music performances that will be recorded and made into a CD and DVD, according to ABC News.
No tickets will be sold for the event. Fans must register for a lottery to win tickets on Staples Center's Web site. Registering for tickets does not guarantee the registrant tickets. The tickets will be randomly distributed; it is not first-come-first-serve.
"It was important to be here because I need the closure of this, I'm still in shock and I can't really get over things," said fan Brenda Smith. "I've been crying and just hysterical for a week, and I need the type of closure that this will bring me."
Registration for tickets is now open and ends at 6 p.m. PT on Saturday, July 4. People will be notified on Sunday if they have been chosen to receive tickets. Two tickets will be issued to each randomly selected attendee.
"We will issue wristbands for everyone that ultimately received the tickets, to make sure that we do not have any issues with people trying to take advantage of this system," said Tim Leiweke, AEG president and CEO.
The service will not be simulcast on screens outside the arena as previously reported. Officials are urging all fans who do not get tickets to stay home and watch the memorial service live on TV or online, and not gather outside the arena.
Police officials say there will be what they call a hard closure around Staples Center on Tuesday. If you don't have a ticket, you won't even be allowed into the immediate area.
Officials also say there will be no public funeral procession. No other details were given about what fans will see at the memorial.
Fans rushed to register for tickets after details of Jackson's memorial were announced. Some became frustrated after the site was overhelmed and they kept receiving messages that the server was unavailable.
"I went on right away so it took me about, probably like 10 minutes," said Lorraine Ortiz. "But my son was on the other computer in the next room and he couldn't get on."
"I've been here since 6 o'clock yesterday. This is kind of frustrating, but I'm going to have faith and pray that I get in," said fan Adriana Ortiz.
One person on eBay will sell one ticket if selected; the bidding starts at $1,500. The hopeful seller says the money made from the ticket would be used to pay for travel expenses to Los Angeles and the rest would be donated to charity.
The streets around Staples are barricaded as work is underway to get the venue ready.
"He has influence so much of the culture," said Ella Gisell, a Jackson fan. "He helped people grow. A lot of his music has to do with social influence and life and peace."
"We're hoping to be here for his service. I've been a fan since a little baby, and what's sad for me is I never saw him in concert, and never will," said Stacy Cantu, a fan from Hawaii.
Police presence is expected to be massive on Tuesday, and at a time when the city of L.A. is dealing with serious budget cutbacks, officials are wondering who will foot the bill for the memorial service.
"So the cost is a major issue, along with the concern about safety. So we will do what we need to do to provide that, and then the cost factor needs to be addressed. I hope AEG stands up and says, 'We will absorb that cost,' as they were receiving the dollars for the tickets that were being sold," said L.A. City Councilman Dennis Zine.
Zine said plans for the memorial are clearly moving forward, but he wished there had been more time to work out the logistics.
"If you can imagine 100,000 people show up and you have 20,000 capacity, there is not sufficient room. Now you have a crowd-control problem," he said. With the July Fourth holiday weekend "it's the worst time ... to work something out."
Jackson's brother Jermaine told CNN's Larry King that there will be a private ceremony for family and some special guests before the public memorial. He added the family wants to have other memorials around the United States.
Jackson had been rehearsing in Los Angeles for a sold-out series of concerts in London.
Promoters said Jackson was healthy enough to perform and passed a five-hour insurance exam.
AEG released on Thursday video of Jackson rehearing just two days before his death. He appears to be as energetic and agile as ever in the video.
The Jackson family has not said what their plans are for Jackson's burial.
There are reports that Jackson could be laid to rest at a Forest Lawn Cemetery in the Hollywood Hills, but that has not been confirmed.
Eyewitness News has learned that businesses around Forest Lawn have been contacted by the LAPD and asked if their facilities can be used on Tuesday by authorities.
New details have been made known about Jackson's will.
ABC News reports that the trust sets aside 40 percent of Jackson's assets for his mother, and the children will also get 40 percent. The remaining 20 percent will go to children's charities.
Jackson's ex-wife Debbie Rowe was left completely out of the will.
Rowe, who met Jackson as a receptionist in the office of his dermatologist, has characterized their relationship as strictly for the purpose of giving birth to Jackson's children.
A judge on Thursday granted a delay in a custody hearing scheduled for next week at the request of Rowe's attorney and Katherine Jackson's attorneys.
Rowe's lawyer said she has not decided whether to seek custody yet.
Rowe gave birth to 12-year-old Prince Michael and 11-year-old Paris. She received at least $8 million when she and Jackson divorced in 1999.
Jackson's youngest child, 7-year-old Prince Michael II, was conceived with an unidentified surrogate.
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The Associated Press contributed to this report.