Section 3

any member of the Singapore Police Force in the exercise of his functions as a police officer;

any member of the Singapore Armed Forces in the exercise of his functions as such member;

any public officer or employee of the Government in the exercise of his functions as such officer or employee;

any officer or employee of the Auxiliary Police Force created under the Police Force Act (Cap. 235) in the exercise of his functions as an auxiliary police officer;

any person appointed under the Air Navigation Act (Cap. 6) to investigate into accidents arising out of or in the course of air navigation and occurring in or over Singapore or to Singapore aircraft; and

any person appointed under the Rapid Transit Systems Act (Cap. 263A) to investigate into accidents on any part of the railway in Singapore.