California Attorney General Jerry Brown has joined the police investigation into Michael Jackson's death. Read on to find out why.

Brown says his office will assist police in determining whether prescription drugs had anything to do with Michael Jackson's death, says the Associated Press. Brown says key information could be provided by a records search of the state database that keeps track of doctors who've written drug prescriptions, the amount of the drugs prescribed, and the patients who've received them.

On Wednesday night, a federal law-enforcement source told ET that the Drug Enforcement Administration (DEA) had also joined the investigation.