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.
Region Updated on Measles Outbreak
Health committee told more work is needed, but gave nod to health care workers for their efforts
St. Catharines Draws X Through X
The city has decided to stop using the social media platform
Police Looking for Laundry Thief
They say she stole some money last month
Toronto Man Charged with Trafficking
Police made the arrest with help from Niagara Parks police, finding fentanyl and cocaine earlier this week
Niagara Falls Man Charged with Trafficking
Police say they watched drug transactions take place
Painting Honours Kristen French
Jennifer Elliotson's painting at Niagara Falls city hall
Keeping Douglas Memorial Public is Goal: Mayor
Fort Erie Mayor Wayne Redekop says it's about convincing the province to help with the centre
Tourism Awards Received in Niagara
St. Catharines and Lincoln partnered on tourism initiatives, and were recognized with provincial award