Salman faces charges of aiding a former terrorist organization and obstruction of justice.
Judge Paul Byron ruled evidence that involves police body-camera video and surveillance video from inside the nightclub will be allowed in court.
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The surveillance video shows Mateen walking around the club with a gun.
The evidence also included cellphone video inside a restroom where Mateen fired at several victims and survivors. In the video, multiple rounds of rapid gunfire can be heard.
Body-camera video from officers showed law enforcement outside of the club giving medical attention to gunshot victims.
Byron ruled last week that a terrorism expert will be allowed to testify about Mateen's Facebook posts on the Islamic State group.
Salman’s trial is set to begin March 1.