Laws of that sort are pretty much unenforceable, because cops don't have the gear required or the skill necessary to do the testing. It's not as simple as just holding a meter to see what it reads. Those who write the regulations think it's that easy, but cops know better, and so do defense lawyers, who will get 99.9% of those tickets dismissed. Cops don't like wasting their time writing tickets that get tossed, so they just don't bother to write them.
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