UMass Dartmouth campus

In the penalty-phase opening, prosecutors argued that Dzhokhar Tsarnaev returned to the UMass Dartmouth campus without his brother after the bombings and came back three days later. Digital-evidence testimony identified a thumb drive seized from Pine Dale Hall, a campus dormitory. Chad Fitzgerald also described April 16 phone activity using New Bedford/Dartmouth towers he recalled as very close to campus, rather than pinpointing activity on campus itself.