Day 17 - May 16, 2025

Andre Porto, a forensic scientist II in the DNA unit at the Massachusetts State Police Crime Lab, was qualified through testimony about his education (UMass Amherst, Boston University School of Medicine), training, proficiency testing, and lab accreditation. He explained the four-step DNA analysis process (extraction, quantitation, amplification, detection) and contamination prevention protocols. Porto then presented his findings on numerous evidence items: a swab from the passenger-side tail light of vehicle 3GC684 (510 nonillion times more likely to include O'Keefe's DNA), a broken drinking glass exterior from 34 Fairview Road (530 nonillion), five stains on the upper right leg of O'Keefe's jeans (ranging from 660 nonillion to 1.0 decillion), stains on O'Keefe's gray long sleeve shirt and orange t-shirt (up to 490 octillion as single-source profiles), and right and left fingernail clippings (490 octillion each, single source). A hair root from the vehicle's exterior passenger-side rear handle yielded no detectable human DNA; the hair shaft was sent to Bode Technology for mitochondrial testing. Four items were not suitable for comparison due to complexity or low DNA quantity.

David Yannetti systematically walked Andre Porto through each evidence item — the passenger-side tail light, broken drinking glass, five stains on O'Keefe's jeans, his sneaker, and his long-sleeve shirt — highlighting that every item contained DNA from multiple contributors beyond John O'Keefe, none of whom were ever identified. Yannetti established that Porto was never asked to compare DNA profiles against Kevin Albert, Kenneth Berkowitz, Brian Albert, or Brian Higgins. Porto confirmed he could not determine when DNA was deposited on the tail light and was unaware the vehicle belonged to O'Keefe's girlfriend. The examination concluded with sustained objections when Yannetti attempted to ask about Porto's report recipients.

On redirect, ADA Adam Lally addressed the cross-examination's emphasis on multiple DNA contributors by having Porto confirm that finding multiple contributors on clothing items is not uncommon in his experience. Lally then walked Porto back through the key DNA findings: the passenger-side tail light swab (510 nonillion times more likely to include O'Keefe's DNA), the 13 stains on O'Keefe's orange t-shirt and gray long sleeve shirt (all single-source, 490 octillion), and the fingernail clippings from both hands (also single-source, included O'Keefe). The redirect was cut short by a sustained objection before Lally could finish his final question.

ADA Lally walks Ashley Vallier through the cross-item phase of her physical match analysis. She describes comparing labeled pieces across multiple evidence items, finding mechanical fits between fragments from items 7-15 and 7-16, items 7-6 and 7-11, and items 7-8, 7-9, and 7-16. The central conclusion: fragments from items 7-5, 7-6, 7-10, 7-11, 7-12, 7-13, 7-15, and 7-16 all mechanically fit with item 3-1, the passenger side tail light housing. Photographs of the reconstructed assembly are admitted as exhibits 182-A and C. Vallier also testifies about debris recovered from John O'Keefe's clothing, including a piece of apparent clear plastic measuring approximately 1/8 inch by 1/16th inch, which was passed to her supervisor Christina Hanley for further analysis.

David Yannetti cross-examines forensic scientist Ashley Vallier, beginning with the tail light reconstruction. He establishes that the reconstructed tail light (item 3-1) had a missing section never accounted for, that Vallier was never told about pieces recovered from One Meadows Street or a collision there, and that DNA analysis found three contributors before her examination. The cross then shifts to chain of custody: Vallier confirms she never saw the clothing itself, only debris extracted by a colleague. Yannetti elicits that Trooper Michael Proctor submitted all submission-7 evidence items to the lab on March 14, 2022 — approximately six weeks after the January 29th incident — and that the lab's chain of custody only begins at intake. Vallier confirms she cannot speak to how the clothing or tail light pieces were handled during that six-week gap.

In this brief 11-utterance redirect, ADA Lally addresses two points raised during Yannetti's cross-examination. He has Vallier confirm that the Massachusetts State Police Crime Laboratory has a separate evidence unit she has no involvement with, establishing that her chain-of-custody responsibility extends only from when she retrieves an item for analysis to when she returns it. Lally then pivots to the bottom-line conclusion: all the items beginning with submission number seven that were discussed during direct examination were mechanical fits to each other and to item 3-1, the tail light housing from the defendant's vehicle. Judge Cannone then dismisses the jury for the day with standard cautions.