"If he's allowed to practice, he needs to be carefully scrutinized," Field said, "until regulators are comfortable that what happened with Michael Jackson is not a problem."
The 56-year-old Murray was at Jackson's bedside when he died June 25. The doctor has admitted to giving the singer propofol, a powerful anesthetic Jackson had requested to help him sleep. It is not meant for use outside a hospital. Since then, Murray has been the focus of the homicide investigation.
Police searched Murray's Houston clinic July 22 and served warrants at his home and office in Las Vegas and properties in California. Murray has not been charged with a crime.
Since Jackson's death, Murray has not been able to work and has been the target of death threats, said his lawyer, Chernoff. He will have his own security at the clinic.
Chernoff said Murray has not been paid by Jackson's estate and has effectively been out of work for seven months. Murray left his practice in April when he took the $150,000-a-month job as the pop star's personal physician.
"Because of a deteriorating financial condition and prompting by many of his beloved patients, on Nov. 20, 2009, Dr. Conrad Murray resumed his cardiology practice in Houston, Texas," Chernoff said in a statement Sunday. "D.r Murray plans to attend to patients in both Las Vegas and Houston."
Five years after his father's death, Murray opened his Houston practice, the Acres Home Heart and Vascular Institute, as a tribute to his father, Dr. Rawle Andrews, a well-respected Houston physician.
"His decision to first return to practice in Houston was made because of the greater need these low-income patients have for his services and the prohibitive cost of reopening his clinic in Las Vegas," Chernoff said in the statement.
Murray last addressed his patients in a YouTube video in August. "I have done all I could do. I told the truth and I have faith the truth will prevail," he said.
Murray told congregants at a Houston church Sunday that he "wanted to go home and take his life back step by step."
Wiping away tears, he asked parishoners to pray for him. "I know what trouble is," he told the congregation, according to RadarOnline.com. "I, with my compassion, was only trying to help my fellow man. But it appears I was at the wrong place at the wrong time."
The Rev. F. N. Williams, one of Murray's patients, credited the doctor with saving his life and defended him in July.
"Hell, he won't give me medicine," Williams said. "He doesn't believe in giving you a lot of pills. I don't believe he was raised to believe in that."