Section 4(3) of the Delhi Special Police Establishment Act, 1946 confers on the Director the power to:

Section 4(3) says the Director shall exercise in respect of the Establishment "such of the powers exercisable by an Inspector-General of Police in respect of the police force in a State as the Central Government may specify". Prosecution is for the Directorate of Prosecution under Section 4BA, and he has no power over State police.