Dr. Arnold Klein, the dermatologist of Michael Jackson and known also as one of his closest friends, has been ordered by the Medical Board of California to undergo a psychological testing — and now he has filed legal papers demanding to know why.

According to reports, Dr. Arnold Klein is suing the Medical Board of California, together with California Attorney General Kamala Harris and the state department of community affairs in a dispute over his license to practice. The lawyer od Dr. Klein has filed the legal docs, suggesting that the psychological testing that he is being subjected to undergo was triggered by “some scurrilous, disreputable source, trying to cause Dr. Klein trouble.” The doctor also claims that he has asked the reason for the examinations, but has been denied of any details.

The Medical Board of California is reported to have ordered Dr. Arnold Klein to submit to a physical exam, which includes “biological testing to determine the presence of scheduled and/or illicit drugs.” The medical board also insists that the doctor submit to psychological testing by a shrink selected by the Board. Apparently, the Board apparently is questioning his competency and wants to know whether he is suffering from a mental or physical illness.

It makes things even tougher for Dr. Arnold Klein, because the Medical Board of California told him that if he does not comply to the testing, there is a possibility that they may suspend his medical license.

According to a Courthouse News Service report on the legal complaint, Klein is a “pioneer in the field of dermatology,” founder of the Elizabeth Taylor HIV Clinic at UCLA, as well as an AmFAR and a director at the David Geffen School of Medicine at UCLA. During the earliest days of the epidemic of HIV/AIDS, Dr. Arnold Klein was among the first doctors to diagnose a case of Kaposi’s sarcoma.

Back in January, the Los Angeles Times reported that Dr. Arnold Klein was bankrupt, a situation which he blamed on embezzling former employees who alleged that his downfall was because of his sexual pursuits and  extravagant lifestyle.

About the same time when the financial troubles of Dr. Klein was emerging, the defense for Dr. Conrad Murray, who would be convicted of involuntary manslaughter in the death of Michael Jackson, was seeking to call Klein to testify at Dr. Murray’s trial. The defense wanted to present an evidence that Dr. Arnold Klein gave the King of Pop huge doses of Demerol and turned the pop singer into an addict. The judge in the case ruled the testimony of Klein as irrelevant and potentially confusing to a jury.

However, Klein — who claimed that Michael Jackson had a gay affair with an assistant in the doctor’s practice — remained under watchful eyes of the Medical Board of California, which opened the investigation to determine whether or not to suspend the license of the doctor. As such, Dr. Arnold Klein has decided to go to court, asking a judge to force the Board to disclose information on who’s behind the testing and why they think he might be unstable.