The documents said Prince did not have any prescriptions, including for fentanyl.

James L. Jones, a spokesman for the U.S. Drug Enforcement Administration’s field office in Chicago, said anyone convicted of writing a prescription for someone under another person’s name could lose their DEA registration — meaning they could no longer prescribe medications — and could face discipline from their state medical board.

In practice, laws against prescribing drugs for someone under a false name are not usually enforced when a doctor intends to protect a celebrity’s privacy, said Los Angeles attorney Ellyn Garofalo. She represented a doctor who was acquitted of all charges, including false name allegations, in the death of Anna Nicole Smith, the Playboy model and reality TV star who died of an accidental overdose in 2007.

“They would be indicting every pharmacist in Beverly Hills if this were strictly enforced,” Garofalo said Monday.

Oxycodone, the generic name for the active ingredient in OxyContin, was not listed as a cause of Prince’s death. But it is part of a family of painkillers driving the nation’s overdose and addiction epidemic, according to the U.S. Centers for Disease Control and Prevention. Nearly 2 million Americans abused or were addicted to prescription opioids, including oxycodone, in 2014.

Patients who take prescription opioids eventually build up a tolerance and need to take stronger doses to get the same effect. In some patients, the cycle leads to addiction.

A search of Prince’s home yielded numerous pills in various containers. Some were in prescription bottles for Johnson. Some pills in other bottles were marked “Watson 853,” a label used for a drug that is a mix of acetaminophen and hydrocodone, another opioid painkiller. Last August, an official with knowledge of the investigation told The Associated Press that at least one of those pills tested positive for fentanyl, meaning the pill was counterfeit and obtained illegally. The official spoke on condition of anonymity because of the ongoing investigation.

In addition to the dozens of pills recovered, authorities also found a pamphlet for an addiction recovery center in California, the documents unsealed Monday show. The day before Prince died, Paisley Park staffers contacted the California addiction specialist as they were trying to get Prince help.

Prince did not have a cellphone and authorities searched multiple email accounts that they believed he was using, as they tried to determine how he got the drug that killed him, according to the search warrants. The search warrants don’t reveal the outcome of the email searches.

The documents also say some of the drugs in Prince’s bedroom were in a suitcase with the name “Peter Bravestrong” on it. Police believe Bravestrong was an alias that Prince used when he traveled.

Investigators have said little publicly about the case over the last year, other than it is active.