Judge Genece Brinkley refused to free him on bail after the announcement from the Philadelphia district attorney's office during a hearing. She scheduled another hearing in June.
Mill, who was born in Philadelphia, was sentenced in November to two to four years in prison for violating probation on a roughly decade-old gun and drug case. Attorney Brian McMonagle said they will reach out to a higher court to get him released.
Spokesman Ben Waxman said the prosecutor's office agreed to support a new trial "due to questions of credibility of the arresting officer." The now-retired officer was among a list of police officers the prosecutor's office has sought to keep off the stand in cases across the city because of credibility questions.
McMonagle said the district attorney's office "has shown a lot of integrity."
"They obviously have recognized and determined the criminal behavior of the arresting officer, which dates back prior to Meek's arrest," he said.
A police spokesman said the department had no comment on the arresting officer allegations.
Mill's incarceration has become a cause celebre, with celebrities offering their support and recent prison visits from New England Patriots owner Robert Kraft, Philadelphia 76ers co-owner Michael Rubin and Philadelphia Mayor Jim Kenney, a Democrat.
Meek Mill's mother, grandmother and 6-year-old son, Papi, were on hand at the rally outside the courthouse, which erupted into cheers after the district attorney's announcement but went silent when it was learned Mill would remain behind bars for now.
"I miss my dad very much," Papi said. "He picks me up from school."
Brinkley has been the subject of harsh criticism from Mill's attorneys. They have unsuccessfully appealed the sentence multiple times and have called for Brinkley to recuse herself.
The judge defended herself this month, saying the court has "has impartially and without prejudice presided over numerous proceedings in this matter since 2008."
She added that "none of the allegations by (the) defendant constitute evidence that this court is unable to act impartially and without personal bias or prejudice with respect to this matter."
She said Mill has raised "unmeritorious claims of impropriety in an attempt to unfairly judge shop."
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