Court documents related to warrants used to search Prince's Paisley Park residence have been disclosed, revealing that authorities found a variety of pills strewn about his home.
A search conducted on April 27, 2016 -- six days after the pop star's unexpected death -- turned up a number of pill bottles that had been labeled as vitamins, according to KSTP. One bottle that was labeled vitamin D contained ondansetron hydrochloride, a drug used to treat nausea and vomiting.
Carver County Sheriff's Office Detective Angela Nucci wrote that she was "made aware by witnesses that were interviewed, that Prince recently had a history of going through withdrawals, which are believed to be the result of the abuse of prescription medicine."
Pill bottles bearing the name Kirk Johnson were found in a second floor dressing room. Johnson worked with Prince as a drummer and acted as the estate manager at Paisley Park, and was one of the people who discovered Prince's body, according to The Associated Press. Johnson was also with Prince when he became ill on a flight and had to be revived with an opioid antidote six days before his death.
In a recent interview with CBS, Johnson refused to give details about the days leading up to Prince's death.
"Kirk has a vault. Right here," he said, pointing to his head. "It's never gonna be unlocked."
AP reports that authorities intend to interview Johnson as part of their investigation into how Prince obtained his medications. Johnson has not been subpoenaed to testify.
In one of the warrants it is stated that Dr. Michael Schulenberg, a primary care physician who worked at a clinic a few miles from Prince's home, told police that "he had prescribed Prince a prescription for oxycodone the same day as the emergency plane landing but put the prescription in Kirk Johnson's name for Prince's privacy."
On May 3, the case officially became a federal Drug Enforcement Administration investigation.
Three more search warrants were executed. A forensic examiner searched the hard drive on Prince's computer and reportedly found valuable evidence.
"The property above-described constitutes evidence which tends to show a crime has been committed, or tends to show that a particular person has committed, or tends to show that a particular person has committed a crime," the warrants states.
Authorities then searched the backpack of 27-year-old Andrew Kornfeld, a pre-med student who was one of three people to find Prince's body. When police first interviewed Kornfeld, he said he was carrying pills in his bag. Among them were buprenorphine and Ativan, which are used to treat addicts when they suffer seizures.
The third warrant seeks to obtain Prince's medical records.
While no charges have been filed in connection to Prince's death, experts said it is likely that authorities are still building their case.
"Federal prosecutors, especially, do not like to lose," Chicago-based attorney Gal Pissetzky told AP. "That is why they can take so long."
Similarly, the lack of subpoenas does not indicate that investigators aren't planning to bring criminal charges against certain individuals.
"The last thing law enforcement wants to do is to potentially have to immunize somebody who could be the only target of the investigation," former federal prosecutor Jeff Cramer said. "At that point, there's no going back ... so chances are they are still running down some leads before coming to that fateful decision."