A psychiatrist has told the District Court in Adelaide that lawyer Eugene McGee was mentally aware and consciously making decisions after a fatal collision.
Eugene McGee was fined after hitting cyclist Ian Humphrey on a road, north of Adelaide, in 2003 and driving off without stopping.
He and his brother Craig McGee are now on trial for conspiracy to attempt to pervert the course of justice.
The charges were laid after a royal commission.
It is alleged the brothers conspired together to prevent police from obtaining a compulsory breath test from Eugene McGee.
It is expected the defence will argue Eugene McGee was experiencing post-traumatic stress disorder and was not totally in control of his actions after the collision.
Psychiatrist Christopher Tennant gave evidence for the prosecution that Eugene McGee’s actions and testimony showed he was aware and conscious of his decisions.