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Since no other violation was charged at the time, you'll have to pay whatever fine it is for the semaphore violation and that's it.
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I doubt that even in MINN, a DA gets bored enough to "go after" a RR crossing violation after a warning ticket was given. And BTW, it's probably not a good idea to admit to having even just a "few beers" , when you have that specific restriction on your license.