Schulenberg is the same doctor who was at Paisley Park on April 21 (the day of Prince's death) when deputies arrived on scene and the same doctor who admitted to authorities, he prescribed Oxycodone for Prince on April 14, the day before he overdosed while returning from a show in Atlanta, forcing his plane into an emergency landing.
On Monday, the search warrants and affidavits from the Carver County Sheriff's Office, which is leading the continuing homicide investigation along with the Drug Enforcement Administration, were unsealed.
Prince, 57, died on April 21, 2016, after he was found unresponsive in an elevator at his home in Minnesota.
Investigators found pills in several parts of Prince's Paisley Park estate outside Minneapolis after he died of an opioid overdose previous year, but none of them had been prescribed to the pop star, according to court records released Monday. Paramedics scrambled to revive him on the tarmac, and he recovered after two shots of naloxone, an overdose antidote increasingly being used and often referred to by its brand name Narcan.
The police are still investigating who supplied Prince with drugs, and in addition to questioning Dr. Schulenberg, they are also searching his emails to see if he had ordered prescriptions online.
Authorities also searched the cellphone records of several associates, including Johnson, and conducted a June 16 interview with the singer Judith Hill.
However, Schulenberg's attorney denied that the doctor had ever written Prince or Prince's friend a prescription of opioids in a statement on Monday.
Schulenberg also told investigators that on April 15, he had prescribed Prince oxycodone, also in Johnson's name.
Johnson had contacted Schulenberg to help treat Prince's hip pain.
Watson 853 is the label for the opioid hydrocodone-acetaminophen, the brand name is Vicodin. One affidavit states that the doctor met with Prince and prescribed him three sedatives: clonidine, hydroxyzine pamoate and diazepam.
The court papers state that officers believe "Peter Bravestrong" to be an alias of Prince, and also found papers with the lyrics to his 1987 track U Got The Look in the suitcase.
Investigators have said they are most concerned with who obtained the fentanyl and have yet to charge anyone over Prince's death. The investigation into Prince's death is ongoing. A person with useful information can exercise their right against self-incrimination if brought before a grand jury, and at that point the only way to get them to talk is to offer immunity.
"I think the unsealing of the search (warrant) makes it abundantly clear again that Andrew had nothing to do with Prince's death", Mauzy said, noting that Kornfeld had never met or talked to Prince. And, experts say, prosecutors and investigators don't want to lose a high-profile case such as Prince's - likely increasing their caution. The Kornfelds' attorney, William Mauzy, has said Andrew had meant to give the medication to a doctor.