LOS ANGELES (AP) _ It's an intravenous drug that's given to people in hospital operating rooms, to knock them out -- but it's almost never found in a private home.

According to a law enforcement official, the powerful sedative Diprivan was found in Michael Jackson's home.

A nurse who'd been working with Jackson as he prepared for his comeback concerts had earlier said Jackson pleaded with her for Diprivan, because he was so distraught over his persistent insomnia. She says she refused and warned him the sedative could be deadly.

Authorities are looking into just what drugs Jackson was taking, and whether he had been given them illegally.

An attorney for the doctor who was with Jackson when he collapsed says he's agreed with investigators not to comment until information is released through official channels. The doctor, Conrad Murray, has spoken to police, and authorities say he is not a suspect.

As plans come together for memorializing Jackson, a Los Angeles city councilman is urging people who don't get tickets to the memorial
service to just stay home and watch it on TV.

Free tickets to Tuesday morning's memorial will be given to 17,500 people through the Staples Center Web site (Staplescenter.com). People can register there until Saturday evening, when names will be randomly selected.

But authorities are afraid that many times that number could try to reach the arena, even without tickets. Assistant Police Chief Early Paysinger says as many as 700,000 people could gather.

A city council member had earlier expressed concerns about the cost of police overtime, in a city that is struggling financially.

There won't be a funeral procession through Los Angeles. And no details of the memorial service itself have been released.