Authorities Return to Search Prince's Paisley Park Home For Ongoing Investigation

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"Detectives are revisiting the scene at Paisley Park as a component of a complete investigation."

Authorities returned to Prince's Minnesota compound on Tuesday to do another search for what was called standard protocol during an ongoing investigation. 

"Detectives are revisiting the scene at Paisley Park as a component of a complete investigation," the sheriff said in a Tuesday evening tweet.

A Carver County Sheriff's Office vehicle and about a dozen unmarked vehicles entered the Paisley Park gates Tuesday afternoon, according to the Associated Press. 

AP is reporting that investigators are working to find out whether Prince died of a drug overdose and if a doctor had been prescribing him drugs in the weeks leading up to his death on April 21, and a since-sealed search warrant revealed more information on Tuesday, the same day the vehicles returned to Prince's compound.

Dr. Michael Todd Schulenberg treated Prince on April 7 and April 20, and he prescribed "medications and prescriptions" for the musician, according to the warrant, which was filed last Thursday in Hennepin County and obtained by at least two news outlets before authorities moved to ensure it was sealed.

The warrant reportedly did not specify which medications were prescribed for Prince or if he took them.

When asked why investigators had returned to Paisley Park, Carver County Sheriff's Chief Deputy Jason Kamerud told the AP by phone that they were "being thorough." 

This comes less than a week after the U.S. Attorney's Office and the Drug Enforcement Administration announced they have joined the investigation into the icon's death.

On Tuesday, TMZ was reporting that the visit was part of a criminal investigation into the doctors who prescribed medication to Prince.

Schulenberg, who was a primary care physician at North Memorial Medical Center, treated Prince on April 7, the day he canceled shows in Atlanta citing illness. He played makeup shows on April 14 and then fell ill on the flight home and was taken by ambulance from the plane during an emergency landing in Moline, Ill.

Schulenberg no longer works for the healthcare system, a spokeswoman for the medical center told the AP.

Prince was found unresponsive in an elevator at Paisley Park on April 21 and was declared dead shortly thereafter. He was 57. Autopsy results are pending.