The heat is on for Michael Jackson's longtime friend and dermatologist Arnold Klein who investigators believe facilitated the years-long drug abuse that could have caused the death of the King of Pop.

According to the warrant and affidavit for last Friday's raid on Mickey Fine Pharmacy in Beverly Hills, Calif. investigators were searching for records of medication Klein allegedly prescribed to himself then gave to Jackson.

Click here to see warrant (PDF).

The return — a list of items seized during the search — was filed Thursday evening in California federal court and shows that investigators seized, "60 prescriptions, 29 patient profile print-outs, three copies of DEA Forms 222 (Order Forms) and copies of inventories of controlled substances."

Law enforcement sources told FOXNews.com that Friday's search of the Beverly Hills pharmacy yielded records of Klein prescribing controlled substances to himself.

According to the warrant for inspection and the affidavit for administrative inspection warrant, both obtained by FOXNews.com, between January 1, 2008 and July 6, 2009, Klein self-prescribed 27 controlled substances, which he filled at Mickey Fine Pharmacy and which investigators believe he gave to his friends — including Michael Jackson, who died of an apparent drug overdose on June 25.

The 60 prescriptions and 29 patient profiles were all related to the investigation into Jackson's death. The patient profiles belong to Jackson and aliases used by the star, law enforcement sources told FOXNews.com.

Investigators used the Controlled Substance Utilization Review and Evaluation System (CURES), a database of all schedule 2 through 4 drugs prescribed by doctors or dispensed by pharmacies or medical facilities in the state of California.

According to the affidavit: "The [CURES] report shows 27 prescriptions written by Dr. Klein in a self-prescribing capacity, specifically prescribing medication to himself, from March 2006 through May 2009. These prescriptions include the medications hydrocodone (Vicodin), modafinil (Provigil), diazepam (Valium), and injectable midazolam (Versed)."

A CURES report for the pharmacy revealed the same self-prescribing information found in Klein's report.

The day after FOXNews.com reported exclusively that Klein was the subject of a criminal investigation likely to culminate in charges related to medical malpractice, Klein's criminal attorney told the DEA that the dermatologist had never self-prescribed.

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Self-prescribing controlled substances is in violation of California Health & Safety Code 11170 —but it is not a criminal act.

The penalties for self-prescribing include fines and a loss of a physician's DEA license to prescribe controlled substances.

Jackson died from lethal doses of the IV anesthetic propofol — which was purchased and administered by the his personal physician Conrad Murray — but investigators believe Klein's longtime facilitation of the pop star's drug habit was so egregious that it meets the threshold of a criminal act.

Investigators believe that Klein supplied Jackson with drugs obtained improperly — by self-prescribing, writing prescriptions using the names of Jackson's many aliases or giving Jackson drugs taken from his office.

In the coming weeks, investigators will focus on obtaining more records of Klein's prescribing history, law enforcement sources tell FOXNews.com.

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