On July 13, 2022, PresidentJoe Biden nominated Guzman to serve as a United States district judge of the United States District Court for the District of Massachusetts. President Biden nominated Guzman to the seat vacated by Judge Timothy S. Hillman, who assumed senior status on July 1, 2022.[7] On September 21, 2022, a hearing on her nomination was held before the Senate Judiciary Committee.[8] Conservatives and law enforcement attacked her nomination, claiming that she is reflexively pro-criminal defendant and pointing out that Guzman had acquitted all 149 defendants who appeared before her in bench trials on drunk driving charges while serving as a judge on Dudley District Court.[9] On December 1, 2022, her nomination was reported out of committee by a 12–10 vote.[10] On January 3, 2023, her nomination was returned to the President under Rule XXXI, Paragraph 6 of the United States Senate; she was renominated later the same day.[11] On February 2, 2023, her nomination was reported out of committee by an 11–9 vote.[12] On February 28, 2023, the Senate invoked cloture on her nomination by a 49–48 vote, with the Vice President Kamala Harrisvoting for the affirmative.[13] On March 1, 2023, her nomination was confirmed by a 49–48 vote, with the vice president casting the tie breaking vote.[14] She received her judicial commission on March 3, 2023.[15] She is the first Hispanic judge to serve on the District Court for the District of Massachusetts.[6][16]
Notable cases
In December 2023, Guzman allowed a lawsuit against 3M and other corporations to proceed. The lawsuit was filed by Massachusetts homeowners who had their water tested and found that their drinking water contained excessive and potentially dangerous amounts of PFAS.[17][18]