Around here (California) they refer to diesel with dye as "red dye diesel".
It's put into diesel that is sold for off-road use....graders, tractors,
etc., without that annoying road tax (about 48 cents per gallon here).
On-road diesel vehicles are checked sometimes at weigh stations and some
state boys sneak around to construction jobsites and check diesel trucks
used by those grader drivers, etc. It's a $1,000 fine if you're caught. I've
never heard of a car being stopped and checked for red dye diesel. That'd be
a waste of their time since their chances of finding a culprit would be very
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