You know the steam that pours out of your exhaust when the vehicle is cold, the boiled condensate that forms in the exhaust?
The way the law is written, just blipping your throttle when cold and someone's around could get you busted. It does not exempt condensate or steam. Since it's Maryland, Land Of Assholes, I'd fully expect to find the ticketbook jockeys camping parking lots in cold weather just because of this.
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Yeah, so, you take your video of someone rolling coal to the cops.
The desk sergeant will look at you, roll his eyes and ask you to fill out some paperwork. He'll assure you that they'll get right on it. If you ask who will be assigned to the case, he'll tell you:
In other words, nothing will happen.
This would be much better dealt with by classing it as gross pollution and handing it off to the 'eco-cops,' which is what many states do. In Texas, you can
report someone rolling coal as a "smoking vehicle" to the state. We used to have a rash of people in the DFW area that thought rolling coal was fun;
the regional governments got together and came up with their own program that's cut way, way, way down on that.
No discrimination against normally operating diesels, enforcement against any idiot running stupid rich/rolling coal/running a 'smoke screen generator' (oil injection into engine) to get their gas engine to simulate rolling coal. It also applies to people rolling coal anywhere, not just onto persons or vehicles. Also, a nice big fine to encourage both compliance and enforcement. That's about four times the average speeding fine, by the way.