The Sarnia Police COPPS Unit made two arrests in unrelated traffic stops on Wednesday.
Officers stopped a suspended driver and found several stolen licence plates in the vehicle.
Police allege the plates were recently used in a number of drive-off gas thefts in the city.
A 26-year-old man is charged with property obtained by crime under $5000, and suspended driving.
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Police also stopped a car in the area of Confederation Street and Trudeau Drive.
They said the driver exited the vehicle and became confrontational with the officer.
Police said they confiscated a "flick knife" from the suspect, which is a prohibited weapon under the Criminal Code of Canada, and a quantity of improperly stored cannabis.
The suspect was eventually handcuffed after allegedly resisting arrest.
A 21-year-old Corunna man faces one count of unauthorized possession of a weapon, one count of resisting a peace officer, and one count of driving a vehicle with cannabis in open baggage under the Cannabis Control Act.