Excuse my ignorance, but doesn't a lamp with a smoked lens still glow red when the red LED's or bulbs are activated? And aren't the tail lamps always illuminated whenever the ignition is powered? I think someone has gotten carried away in their interpretation of that regulation. Admittedly the ones I've looked at on Harley's aren't terribly bright even at night, but they do look red to me. Perhaps the problem comes from the requirement that they be visible from 1000 feet away. In my experience they aren't all that visible from 100 feet away.
I would suggest that you refer anyone wanting to cite you to the Harley-Davidson Motor Company, Milwaukee, Wisconsin, and the NHTSA. Supposedly the vehicle met all Federal and State motor vehicle regulations when it was sold, and if some individual LEO's want to start some chit they need to start it at the source, not with the end user. If a state wants to play jackass after the fact, they need to see about forcing the MoCo to retrofit all those illegal bikes they certified were legal when they sold them in that state. I'm willing to bet it won't happen, and Federal regulations will trump an outdated state reg.
I personally prefer to maximize visibility with good old fashioned red lenses and bright bulbs, versus the currently trendy stealth approach of smoked lenses. I was amazed that the Federal government allowed this. I wasn't amazed that Harley would reduce visibility and safety in the name of style though.
Jerry