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.
Public Health Asking for $42-Mill
It's a funding request for this year to the province
Fort Erie Increasing Pressure on Niagara Health
The town considering asking management to resign
Young Offender Arrested in Vape Store Theft
Police looking for another suspect after the robbery in Fort Erie Tuesday morning
150th Birthday Celebrated at Montebello Park
The event starts at noon on Saturday
City Encouraged to Go After Funding
Haley Bateman concerned taxes will go 'wild'
Cost of Renewing Vows Could Rise
The Honeymoon Capital of the World considering options
GM Investing in St. Catharines
The car company investing millions
NRP Investigating Fatal Pelham Crash
This happened last night on Highway 20