A lawyer for a friend of Boston Marathon bombing suspect Dzhokhar Tsarnaev has told jurors the man didn't lie to the FBI during the bombing investigation but couldn't remember certain details because he had smoked marijuana "for 12 hours straight."

Robel Phillipos is charged with lying about being in Tsarnaev's dorm room at the University of Massachusetts-Dartmouth while two other friends removed a backpack and other potential evidence several days after the April 15, 2013 attack. Two bombs placed near the marathon finish line killed three people and injured more than 260.

During closing arguments Tuesday, Phillipos' lawyer said his client was in Tsarnaev's dorm room but never saw the backpack.

A prosecutor told the jury the case is "about someone who lied, not about someone who didn't remember."