Every time you send a text message, swipe a credit card, use a GPS system or go into a public building, you leave a digital record of your activities. And if you're 19 years old, those records are likely to be extensive. Boeri and Cullen review the data dump the prosecution unloaded on Dzhokhar Tsarnaev and his deceased older brother, Tamerlan, in Day 13 of the trial.