While the prosecution holds that the attack must have been carried out by more than one person, the defense has argued that the elder Wang might have been capable of doing it by himself under the influence of drugs.
Two psychiatrists testified on Chuang's mental condition because the defense team had claimed that he seemed to have suffered from a mental disorder while in detention and might be unfit for trial.
According to the psychiatrists, whom Chuang had seen between 1998 and 1999 at the detention house, Chuang had hallucinations, but in general had no problems talking and communicating.
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