"We have taken our time with this to make sure it's done correctly," an LA police commander tells PEOPLE

By Howard Breuer
Updated November 21, 2009 10:10 AM
Houston Chronicle/AP; Globe

It will be at least a couple of more months before authorities decide whether to arrest Dr. Conrad Murray, the personal physician who treated Michael Jackson before his death.

“A decision (on whether to prosecute) will be made in 2010. It is not going to be made this year,” LAPD Commander Patrick Gannon tells PEOPLE.

Although Jackson’s June 25 death was ruled a homicide by the county coroner, which found lethal levels of the toxic anesthetic propofol in his body, and Murray admitted to administering propofol at Jackson’s bedside to help him sleep, authorities have to determine whether Murray was solely responsible, and to what extent any negligence can be considered criminal.

According to a search warrant unsealed Friday, Murray “said he was not the first doctor to introduce Jackson to propofol. … Jackson referred to it as his ‘milk,'” and Jackson had several doctors locally and abroad who gave him propofol.

Police are being careful, and consulting with other agencies including the state medical board and the Los Angeles County District Attorney’s office, which will ultimately decide what charges to file, if any, Gannon says.

“We have taken our time with this to make sure it’s done correctly,” Gannon says.

Michael’s sister, Janet Jackson, and other family members say they blame Murray for Jackson’s death, but the doctor has consistently denied any wrongdoing.