I checked with the local police. He said as far as he knew there was no Kansas law about the blue dot. He did caution that the law says tail lights do need to be red except the turn signals can be yellow and it must have a clear light for the tag. He also said the blue dot could become outlawed just like the neon lights under a car was once outlawed. Currently neon lights are allowed in certain colors, but can't flash. He went on to say there is about 300 laws that change every year and it is hard for police officers to keep up with the changes. For what it is worth, he said he personally wouldn't pull anyone over for having the blue dot even if it was a law.
I don't think I'll bother, I do too much driving at night working second shift. I'd rather "Barney Fife" stays comfortable in his car than visit with me.