Tuan Ng started his early career as a Police Inspector with the Royal Malaysia Police in 1982. He was then posted to serve in Sarawak until the rank of Assistant Superintendent of Police for 20 years. During his tenure in Sarawak, his exposure included the Criminal Investigation Department ("CID"), General Duty and Police Field Force.

In 2003, Tuan Ng was transferred to Selangor Police Contingent Headquarters. In 2005, he was promoted to Deputy Superintendent of Police and served in the Commercial CID, Selangor Police Contingent Headquarters. He left this posting as Superintendent of Police.

After that, Tuan Ng was posted to the Johor Police Contingent Headquarters as Deputy Head of Commercial Crimes Investigation Department in 2014. Then in the same year, he was posted to the Commercial CID, Royal Malaysia Police Bukit Aman as Assistant Director in the Forensic Accounting Investigation Division.

The last held position of Tuan Ng was Principal Assistant Director in Forensic Accounting Investigation Division, Commercial CID, Royal Malaysia Police, Bukit Aman.

Throughout his 36 years service in Royal Malaysia Police, he was very much involved in police investigations due to his legal background. He specialises in criminal investigation across various fields which include commercial crime, general crime and forensic accounting with ample management and special operations experience.

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