WARWICK Reid, who has expressed fears over his own safety and been in ICAC custody since March 1990, will serve the rest of his sentence in Correctional Services custody.
Reid, 45, who was sentenced to eight years' jail by Chief Justice Sir Ti Liang Yang for corruption, was removed to the security wing of the Siu Lam psychiatric centre on Saturday.
According to an ICAC spokesman, the decision to transfer Reid was taken because he was no longer required to give evidence in forthcoming trials.
Reid has given evidence in three trials, during which he expressed fears for his safety, saying he would rather be in ICAC custody than in jail.
The last trial in which he was to testify was scheduled for April, when Eddie Soh faced a charge of conspiracy to assist Reid escape from Hongkong.
Reid had been granted immunity from prosecution in relation to his accepting bribes and for possessing a gun, ammunition and a forged passport provided he gave full and truthful evidence in the trials.