Dzhokhar Tsarnaev

The trial for suspected Boston Marathon bomber Dzhokhar Tsarnaev continued Monday as defense attorneys grilled FBI Special Agent Kevin Swindon about his knowledge of computers and the evidence.

MassLive.com reports that attorney William Fick appeared to grow agitated as Swindon struggled to answer some of his questions.

Swindon was unable to answer some of the questions directly, frustrating Fick.

The testimony sheds some light on the defense’s strategy, which appears to be discrediting the evidence.

The evidence was collected from three computers.

The trial continues today.