Right-handed or left-handed?

Does anybody have any clear information on it? I can only judge from the photo where he's wearing his wristwatch on the right wrist, many left-handed people (but not all) wear bracelets/wristwatches on the right wrist to make writing comfortable.

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In the theme "Are you left-handed or right-handed?" back to the time when he was dwelling on the old Columbine forum Adam replied with "Ambisinistrous. : (" but it doesn't give us a clear answer.

In the pictures where he holds his guns and the trajectory of his suicide shot it points to right-handedness

Also when he tries to cover the camera in one of the DDR videos he does it with his right hand.