Niagara police stopped about 350 vehicles during R.I.D.E. checks in St. Catharines and Thorold Saturday night.
Two drivers were given breathylzers and one of them registered an alert.
That motorist was issued a three-day license suspension.
Numerous fines were issued to drivers under the Highway Traffic Act and Compulsory Automobile Insurance Act , including one class G1 licensed driver operating his vehicle without a class G license holder.