Police seized a knife from a driver at Yowie Bay during a random stop on Thursday, December 16.
At about 10.30pm, police pulled over a Holden Commodore on Attunga Road for a random breath test, which was negative but a random drug test tested positive to cocaine.
His car was searched and police found a knife.
The man, 19, was arrested and taken to Sutherland Police Station where he was charged with custody of a knife in a public place and possessing a prohibited drug.
He was bailed to appear at Sutherland Local Court on January 28.
It was part of a two-day police operation targeting street-level crime - including knife crime - in Sydney's metropolitan area.
Operation Saber VII is an intelligence-led initiative, focusing on people and places known to have previously been involved in knife-crime offences.
Officers from all 31 Police Area Commands within the Sydney metropolitan region joined forces with specialist units, including Traffic and Highway Patrol, and Police Transport Command, to conduct a proactive high-visibility police operation.
During the operation, police seized 28 knives, conducted 1043 person searches resulting in 106 drug detections.
Operation Saber VII Commander, Inspector Andrew Mackay, said he was very pleased with the results, and more deployments like this can be expected in the new year.
"Operation Saber VII has been an outstanding example of proactive and collaborative police work between all metropolitan regions, reassuring the community that they can go about their lives feeling safe," Inspector Mackay said.
"We will continue our focus on these types of offences, as every knife taken off the streets is one less weapon that could have been used to cause fear or violence in the community."
Sign up for our newsletter to stay up to date.