Prince: Cops Search Singer's Pharmacy for Clues

[CORREA]

Prince was able to get his supply of prescription drugs from more than one doctor ... and at least one of them was a "personal friend" of Prince ... this according to members of the singer's family.

TMZ broke the story ... Prince developed an addiction to Percocet sometime before his hip surgery in 2010, and almost died from an overdose 6 days before his death.

What's significant ... Percocet is a controlled substance, and a single doctor who prescribes an excessive number of pills will be flagged by state and federal authorities. As a result, as in Michael Jackson's case, someone addicted to a drug who needs more than the medically necessary amount will doctor shop.

As we reported, Prince went to a local Walgreens pharmacy 4 times in the week he died to fill prescriptions. Our sources say authorities are on the hunt for the various doctors who prescribed and pharmacies that filled Prince's prescriptions. We're told authorities are also interested in possible aliases the singer might have used.

As for at least one of the doctors being friends with Prince, it may have shades of Michael Jackson. In Jackson's case, a number of doctors crossed the line by prescribing drugs that were not medically necessary, in order to ingratiate themselves with the singer.

Authorities descended on a Walgreens near Paisley Park and served a search warrant on the pharmacy, TMZ has learned, looking for a prescription paper trail that could unravel the cause of Prince's death.

It's the same drug store chain where Prince made 4 Rx runs in the week leading up to his death.

We're told investigators made their move Thursday. Once inside, they beelined it for the pharmacy and spent several hours combing through records.

As we reported, authorities are especially interested in Percocet ... the drug that triggered a near-fatal OD 6 days before Prince's death. They're also looking for other prescriptions in Prince's name or identifiable aliases.

We're told investigators are also targeting other pharmacies and doctors who may have helped Prince procure meds.