Charges against Northern Territory Police Commissioner John McRoberts have been dismissed by a Darwin court.

Former NT police officer Steven Isles in September last year launched a private prosecution against Mr McRoberts on the charge of abusing an office of authority.

But the case was dismissed by the Darwin Magistrates Court on Wednesday due to a technicality.

Magistrate Sue Oliver determined that police commissioners could not be found guilty of committing a crime contrary to section 82 of the Criminal Code because they were not technically employed in the public service.

"There is no purpose to the matter proceeding further to a hearing," Ms Oliver said.