To look it up, you should take a gander at your state gov website, at their Statutes. Most states have them all digitized, with the ability to view past changes and or omissions.
Only by going to the statutes, having that statute number, and preferably having a copy of it on the bike, will you be able to show police officers they are mistaken.
In a similar incident, I was on my way home from work. Going 30 in a 30 mph zone with traffic, state trooper pulled me over to inform me that I can't be travelling with traffic as I'm a "motor-assisted bicycle." Threatened to give me a ticket and such.
Now, instead of that bullshit, I carry a copy of the revised statute, which states the new CT moped laws which omitted such rules.