Following the prosecution's decision not to appeal his acquittal on Tuesday, former Central Narcotics Bureau chief Ng Boon Gay said he can now focus on moving forward with his life.

"I am a law enforcement officer at heart and it saddens me to find myself at the wrong end of the investigations," Mr Ng, 46, said in a statement. "I have always had faith in the criminal justice system, having been a part of it my whole working life, but I must admit that there were times throughout the ordeal when I couldn't help but feel disheartened."

"Overall, it has been a truly humbling experience for me," he added.

His lawyer, Senior Counsel Tan Chee Meng, said that the Attorney-General Chamber's (AGC) remarks on the "strength" of District Judge Siva Shanmugam's grounds of decision has "fully vindicated our client".

The AGC had, in a statement issued earlier Tuesday, said that there is "no proposition of law emanating from the grounds of decision (that) requires clarification by the High Court". It added that "none of the learned District Judge's findings of fact are of a nature that would in our view necessitate an appeal".

But Mr Ng still faces civil service disciplinary investigations brought about by the Ministry of Home Affairs, which were suspended in view of the criminal proceedings. Mr Tan said: "This has been a very trying period for him. His ordeal is however not over."