An Australian Federal Police officer and two senior New South Wales policemen have tested positive for illicit drugs.

New South Wales Police says two commissioned officers from the state's Northern Region have been suspended.

And the AFP says an air security officer has been suspended without pay.

It says its Professional Standards Internal Investigations Unit is investigating the "incident".

NSW Police Commissioner Andrew Scipione had a clear message this morning for the officers involved.

"For many years now we've been saying there is a zero tolerance policy when it comes to the use of illegal drugs," Commissioner Scipione said.

"People need to decide whether they actually want to be police officers or they want to take drugs, because the two can't be reconciled.

"If you take those drugs, if you take recreational drugs, there is no place for you in the NSW Police Force."