Testimony resumed in the trial of Robel Phillipos, a friend of Boston Marathon bombing suspect Dzhokhar Tsarnaev.
Wednesday's main witness was another friend already convicted in the investigation, Azamat Tazhayakov, testifying for the prosecution.
Phillipos is charged with lying to federal investigators.
Prosecutors alleged he lied about being in Tsarnaev's dorm room at UMass Dartmouth when Tazhayakov and Dias Kadyrbayev removed a backpack and other potential evidence.
However, Phillipos' defense attorney said his client's memory was clouded by heavy marijuana use.
Tazhayakov testified that earlier during the day in question, he watched Phillipos smoke marijuana for about thirty minutes.
Tazhayakov has not yet been sentenced for his conviction in the case. In court, Tazhayakov acknowledged that his testimony against Phillipos could help his sentencing.
Tsarnaev's rommate at UMass Dartmouth, Andrew Dwinells, also testified.