Patrick Moynihan identified fingerprints belonging to Dzhokhar and Tamerlan Tsarnaev on vehicles and recovered items as a prosecution expert on Day 35. On cross-examination, he acknowledged that fingerprints cannot be dated or reliably establish who drove a vehicle, and described receipts recovered from Tamerlan's wallet.
Patrick Moynihan
State police Crime Scene Services employee trained in criminal justice and crime scene documentation.
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Patrick Moynihan testified on Day 35 as a prosecution fingerprint expert from the Massachusetts State Police Crime Scene Services section. Qualified without objection, he explained the ACE-V comparison process, verification by two additional analysts, and conditions that can prevent usable fingerprints. He described processing the Honda Civic and Mercedes SUV at the Watertown Police Department garage on April 20, 2013.
Moynihan identified Dzhokhar Tsarnaev's prints on the Honda's rear driver's-side door, radio face, and iPod Nano, and an exterior Honda print belonging to Tamerlan. On the Mercedes, he attributed ten exterior prints and two prints on interior items to Dzhokhar, and three exterior prints and seven on interior items to Tamerlan. He also identified Dzhokhar's print on a Mercedes CD but declined to identify bumper stains as blood. The court admitted photographs and physical evidence while the defense preserved its CD objections; several comparison charts were shown as illustrations rather than admitted evidence.
Under Judy Clarke's cross-examination, Moynihan acknowledged that fingerprints cannot establish when contact occurred and that driving need not leave identifiable prints. After a collection report refreshed his recollection, he described receipts from Tamerlan's wallet for two backpacks, a $900 transfer to Russia, a soldering gun, and a gun-and-ammunition-store transaction. He confirmed where the receipts were recovered, not who made the transactions, and would not confirm the MoneyGram receipt's named sender without seeing it. The government offered a recovery stipulation without opposing admission, and the court said the available receipts could be admitted. There was no redirect.
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