A man who police allege was driving a car involved in a crash that killed a brother and sister in Sydney's south-west has a cyst in his brain that can have "serious effects" on behaviour, a court has heard.Alina Kauffman and her brother, Ernesto Salazer, died in the collisionAlina Kauffman, 24, and her 15-year-old brother, Ernesto Salazer died after their car was hit by a black Mercedes just metres from their home at Heckenberg on Friday night.
But the prosecution told the court there was "no medical documentation to support what's in the letter".
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