Pedro Claudio, Jr., appeals from a judgment of a single justice of this court denying his petition for relief under G. L. c. 211, § 3. We affirm.

Claudio pleaded guilty in 1995 to multiple charges. On three separate occasions thereafter, he filed motions to withdraw his pleas, each of which was denied by the plea judge. In 2011, he appealed from the denial of the third such motion. The Appeals Court affirmed, and we denied further appellate review. Commonwealth v. Claudio, 83 Mass. App. Ct. 1108 (2013), S.C., 466 Mass. 1103 (2013). Along the way Claudio filed two petitions in the county court pursuant to G. L. c. 211, § 3 -- one before his appeal was docketed in the Appeals Court, and one after the appeal had been decided and his application for further review was pending. Both petitions were denied. This is his appeal from the denial of the second petition. [Note 1]

The single justice was correct to deny the petition. Claudio's recourse, after his motion to withdraw his pleas was denied in the trial court, was to appeal to the Appeals Court and, if dissatisfied with the result there, to apply for further appellate review. See Mass. R. A. P. 27.1, as amended, 441 Mass. 1601 (2004). That is the normal appellate process; he fully availed himself of it. This court's extraordinary power of general superintendence is not meant to be used in lieu of the normal process or to obtain an additional layer of review after the normal process has run its course. See Cruthird v. Commonwealth, 444 Mass. 1002 (2005); Votta v. Police Dep't of Billerica, 444 Mass. 1001 (2005).

Judgment affirmed.

The case was submitted on briefs.

Pedro Claudio, Jr., pro se.

Elin H. Graydon, Assistant District Attorney, for the Commonwealth.

In June, 2011, allegations of misconduct at the William A. Hinton State Laboratory Institute in the Jamaica Plain section of Boston surfaced regarding work performed by Annie Dookhan, a chemist who had been employed in the forensic drug laboratory (Hinton drug lab) since November, 2003. Based on investigations conducted by the Department of Public Health and the State police, Dookhan was indicted on multiple counts of evidence tampering and obstruction of justice, as well as on at least one count of perjury and one count of falsely claiming to hold a graduate degree, all relating to her handling and testing of samples at the Hinton drug lab. See Commonwealth v. Scott, ante 336, 337-342 (2014); Commonwealth v. Charles, 466 Mass. 63, 64 (2013). Dookhan resigned from her position, effective March 9, 2012, and the Hinton drug lab was closed on August 30, 2012. The present case is one of several that has arisen as a consequence of the testing of drug evidence by Dookhan at that facility. We decide this appeal on the basis of our opinion today in Scott. [Note 1]

A criminal complaint issued from the Dorchester Division of the Boston Municipal Court Department charging the defendant, Geordano Rodriguez, with possession with intent to distribute a class A controlled substance (heroin), G. L. c. 94C, § 32 (a) (count I); commission of this offense within a school zone, G. L. c. 94C, § 32J (count II); and possession of a class D controlled substance (marijuana), G. L. c. 94C, § 34 (count III). The substances in the four plastic bags seized from the defendant were sent to the Hinton drug lab for testing, and they were determined to contain 5.19 grams of heroin. The first signature on the certificate of drug analysis, on the line labeled "Assistant Analysts," was that of Dookhan. [Note 2] On January 10, 2006, the defendant tendered an admission to sufficient facts to warrant findings of guilty on counts I and III, conditioned on specific dispositional terms that were agreed to by the Commonwealth. See Dist./Mun. Cts. R. Crim. P. 4 (c). Count I was reduced to possession of a class A substance, and count II was dismissed. [Note 3] The defendant was sentenced to a one-year term of probation on counts I and III, to run concurrently, and the judge imposed an additional penalty of fifty hours of community service.

On November 19, 2012, the defendant filed a motion to withdraw his guilty pleas pursuant to Mass. R. Crim. P. 30 (b), as appearing in 435 Mass. 1501 (2001). He claimed that, as a consequence of Dookhan's misconduct at the Hinton drug lab, his guilty pleas were not "knowing and voluntary," his due process rights were violated by the Commonwealth's failure to provide true and accurate discovery prior to his guilty pleas, and the evidence relating to Dookhan's misconduct constituted "newly discovered exculpatory evidence."

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Following a hearing on February 11, 2013, [Note 4] a judge denied the defendant's motion but made no written findings. The defendant appealed, and we granted his application for direct appellate review. [Note 5]

An admission to sufficient facts is treated as a plea of guilty. Luk v. Commonwealth, 421 Mass. 415, 418 n.6 (1995), citing Commonwealth v. Duquette, 386 Mass. 834, 841 (1982). A motion to withdraw a guilty plea is treated as a motion for a new trial pursuant to Mass. R. Crim. P. 30 (b). Commonwealth v. Furr, 454 Mass. 101, 106 (2009). A judge may grant such a motion "if it appears that justice may not have been done." Mass. R. Crim. P. 30 (b). See Commonwealth v. Grace, 397 Mass. 303, 305 (1986). A motion for a new trial is committed to the sound discretion of the judge. Commonwealth v. Russin, 420 Mass. 309, 318 (1995). We review a judge's denial of a motion for a new trial "to determine whether there has been a significant error of law or other abuse of discretion." Commonwealth v. Robideau, 464 Mass. 699, 701-702 (2013), quoting Grace, supra at 307.

The defendant contends on appeal, as he did during the hearing on his motion to withdraw his guilty pleas, that his motion should have been allowed because Dookhan's misconduct rendered his pleas involuntary and unintelligent, such misconduct constituted newly discovered evidence that cast real doubt on the justness of his convictions, and the Commonwealth failed to provide him with material exculpatory evidence prior to his admission to sufficient facts. Based on our reasoning in Scott, supra at 362, we conclude that the defendant is entitled to a conclusive presumption that Dookhan's misconduct happened in his case, that such misconduct was egregious, and that its occurrence was attributable to the Commonwealth. However, in order to prevail on his motion, the defendant still must demonstrate a reasonable probability that had he known of Dookhan's misconduct at the Hinton drug lab, he would not have pleaded guilty to the charges against him and would have insisted on going to trial. Id. The judge has made no findings on this matter. Accordingly, we vacate the judge's denial of the defendant's motion to withdraw his guilty pleas, and we remand the case for further proceedings and findings in accordance with this opinion and our reasoning in Scott.

So ordered.

Claudia Leis Bolgen for the defendant.

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Vincent J. DeMore, Assistant District Attorney, for the Commonwealth.

The following submitted briefs for amici curiae:

Keith A. Findley, of Wisconsin; M. Christopher Fabricant & David Loftis, of New York; Howard Schiffman, Katherine L. Schuerman, & Michael Sanocki, of the District of Columbia; & David Duncan, for The Innocence Network.

Emma A. Andersson & Ezekiel R. Edwards, of New York; Emily A. Cardy & Eric Brandt, Committee for Public Counsel Services; & Matthew R. Segal & Elizabeth A. Lunt, for Committee for Public Counsel Services & others.