Drug Enforcement Administration spokesman Jose Martinez said agents were serving a warrant Friday at the Mickey Fine Pharmacy & Grill, seeking evidence of improper dispensing of controlled substances.
The pharmacy sued Jackson in January of 2007, claiming the singer owed more than $100,000 for prescription drugs over the previous two years. The matter was quickly resolved, and Jackson's spokeswoman at the time said it was related to the administration of the singer's finances.
Friday's raid comes a week after authorities raided a Nevada pharmacy where Dr. Conrad Murray, the doctor who was with Jackson when he died, bought the anesthetic propofol.
Authorities have said Murray administered the drug to Jackson in the hours before his death and is the focus of a manslaughter investigation. No charges have been filed and the cause of Jackson's death has not been made public.