Be careful if you are a Canadian in the US!

Georgia has a reputation for speed traps. The Canada thing was just an excuse to make it more ominous to the driver. These jurisdictions live on traffic fines and they make it very hard on anyone who tries to fight. They usually offer a quick settlement in a traffic court if you don't fight and pay right then.
Texas had a few of those for years and it took a state law to bring it to an end.
With the all the time news cycle this type of thing probably will finally fade out.
It has nothing to do with homeland security or immigration. It is just plain greed and intimidation.