Danielli was originally charged with trafficking oxycodone pills, but he pleaded guilty to a lesser charge in June after state officials told Norfolk County prosecutors that drug samples in his case might be called into question.
The construction worker and father of four did not speak with reporters as he left court. He was ordered to return for a Nov. 12 update on his case.
Prosecutors supported Danielli’s motion to withdraw his plea because of the questions raised in the widening investigation into the chemist’s actions.
‘‘He pleaded guilty based in large part on evidence that was quite possibly tainted,’’ said John Martin, Danielli’s lawyer. ‘‘His guilty plea can’t stand.’’
Lavoie reported from Dedham. Associated Press writer Lindsey Anderson contributed to this report.