Christopher Frias

Christopher Frias authenticated UMass Dartmouth fitness-center surveillance during the prosecution's direct examination on Day 29. As the university's IT infrastructure project manager, he explained how campus access-control and camera data were preserved for police.

Frias described reviewing footage at police request and retrieving three surveillance segments using the date and time in a record bearing Jahar Tsarnaev's name. He affirmed the accuracy of the surveillance and timestamps in his experience, identified April 16 timestamps of 9:05 p.m. and 10:08 p.m., and explained barcode check-in and the entrance and secondary-exit camera views.

The court admitted three videos and screenshot 1504 without objection, and the three videos were played. The judge also admitted screenshots identified orally as 1505 and 1506, although the transcript's receipt parenthetical lists 1105 and 1106. The defense asked Frias no questions.