The NRP stopped about 600 vehicles during R.I.D.E. programs in St. Catharines and Port Colborne.
Officers administered 26 roadside screening tests on Monday and four drivers found themselves in the warning range.
They each face a three-day licence suspension.
The officers also issued tickets for traffic related offences.
Name of Murder Victim Revealed
Police were called earlier this month to a house in St. Catharines, found dead woman and injured man
NRP Arrest Man for Human Trafficking
Update: 2nd suspect arrested in relation to a woman being trafficked in the Niagara Region, a forced marriage charge included
Man Arrested After Posting Stolen Loot
Police were looking for a stolen Toyota and golf clubs from Grimsby
Niagara Parks Strike Potentially Avoided
Workers vote tomorrow on whether to accept deal or not
Action Wanted on GM Plant Clean Up
St. Catharines MPP asking the government to use the Environmental Protection Act
Niagara Teens Included in Auto Theft Ring
Over $5-million has been recovered
Woman Dies After Apartment Fire
Update: Emergency crews called to Niagara Falls apartment last night
Pelting Rain Didn't Stop Cancer Run
Organizers of Rankin run at Brock University overwhelmed at community support