Comment: Since we're on the border subject...

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Since we're on the border subject...

I've noticed along the backroads and ATV trails and such approximately where the border should be, you occasionally encounter these red lasers about 2 feet off the ground. They very much remind me of the lasers they used to have in store doorways that count the people entering or leaving, except these go for miles (but aren't everywhere, just in pockets). You can't see them unless they're shining right on something, like your leg. Anyone have any idea what these are?