Day 20 - June 5, 2024

David Yannetti cross-examines Ashley Vallier on the evidence handling and collection timeline of tail light debris. He establishes that Vallier did not examine the clothing items themselves, only debris separated from them, and that she does not know which trooper delivered the clothing to the lab. The core of the cross focuses on contrasting the collection dates and sizes of plastic pieces: smaller fragments collected by Trooper DiCicco on February 3rd (five days after the incident) versus progressively larger pieces collected by Trooper Proctor on February 8th, 11th, and 18th — up to three weeks later. Yannetti emphasizes that Proctor hand-delivered all his evidence bags to the lab on March 14th, six weeks after the incident, and that Vallier does not know what Proctor did with the evidence before that date. The cross concludes by establishing that a section of the reconstructed tail light remains missing and unaccounted for.

In a brief 19-utterance redirect, ADA Lally addresses two points from Yannetti's cross-examination. He establishes that the debris from the clothing items was transferred to Vallier's unit by Maureen Hartnett, providing a chain-of-custody link the cross had left open. He has Vallier confirm the tiny plastic pieces (an eighth by a sixteenth of an inch) were observed both visually and through a stereo zoom microscope, reinforcing her methodology. Lally then turns the cross-examination's emphasis on collection gaps into a concession — Vallier confirms she knows nothing about who collected the evidence, when, or how — before immediately redirecting to the bottom-line conclusion: all the pieces she assembled mechanically fit onto the tail light housing from the defendant's vehicle.

Christina Hanley, a forensic scientist and unit supervisor at the Massachusetts State Police crime lab with 16 years of experience, testified about her examination and comparison of glass and plastic evidence. She found a physical match between a broken drinking glass (item 3-2) and six of nine glass pieces recovered from 34 Fairview Road (item 7-12), establishing they were once part of the same object. She also found that a glass piece from the vehicle's bumper (item 3-3, piece E) was consistent in physical and instrumental properties with glass found on the ground (item 7-14). Finally, she determined that clear and red plastic debris scraped from the victim's clothing (item 7-18.18) was consistent in color, microscopic appearance, and instrumental properties with plastic from the defendant's passenger-side tail light (item 3-1).

Alan Jackson methodically walked Christina Hanley through her glass comparison results using a four-category framework: the drinking glass (3-2), bumper glass pieces (3-3), nine scene glass pieces (7-12), and a single scene glass piece (7-14). Jackson established that while six of nine scene pieces matched the cup, none of the bumper glass matched the cup. He highlighted that the single glass piece (7-14) matched only bumper piece E and did not match the cup or any of the nine scene pieces — it 'stands alone.' Jackson attempted to introduce a chain of custody document (BV) and a visual summary chart (WW), but both were met with objections and judicial limitations discussed at sidebar.

In a brief redirect, ADA Lally attempted to ask Hanley about general commonalities of plastic and glass materials, but the question was sustained as beyond the scope of cross-examination. Lally then had Hanley reconfirm that six of the nine glass pieces from the scene (item 7-12) matched the drinking glass, and that piece E from the vehicle bumper (item 3-3) was consistent with clear glass found on the ground at 34 Fairview Road. The defense had nothing further, and Hanley was excused.