LOS ANGELES, California (CNN) -- Singer Michael Jackson took more than 10 Xanax pills a night, asking his employees to get the prescription sleep medicine under their names and also personally traveling to doctor's offices in other states to obtain them, said a confidential document from 2004 that CNN obtained Thursday.
The document from the Santa Barbara County Sheriff's Department contains confidential interviews conducted with two of Jackson's former security guards as officials prepared for Jackson's child molestation trial in 2005.
The singer was acquitted after the 14-week trial. But the information about the sleeping pills, and the lengths Jackson went to get them, adds to a growing mountain of claims tying the insomniac singer to drugs in recent days.
Los Angeles Police Chief William Bratton said Thursday detectives have spoken to a number of doctors who have treated Jackson over the years, and are looking into the singer's prescription drug history.
Doctors who did not cooperate with investigators were issued subpoenas, a source told CNN Thursday. If needed, authorities will issue more, the source said.
Jackson died on June 25. Authorities are awaiting toxicology reports from the coroner's office to determine the exact cause of death.
"And based on those, we will have an idea of what it is we are dealing (with): are we dealing with a homicide or are we dealing with an accidental overdose?" Bratton said.
The speculation that prescription drugs, particularly sedatives, could have played a role in Jackson's death keeps coming up with each new nugget of information -- and there have been many.
The Jackson family knows that the probe into his death can turn into a criminal case, a source close to the family told CNN on Thursday.
