There are federal and state laws that protect truck drivers in Maine who refuse to operate illegally. For instance, if you have refused to drive longer than the DOT allows, refused to doctor your logbook, refused to drive an unsafe truck, or complained about violations of DOT regulations, the law prohibits your employer from retaliating against you. (Incidentally, that was not an exhaustive list of illegal reasons for an employer to retaliate against you, just some examples.) The federal law that protects you is the Surface Transportation Assistance Act (STAA). In Maine, the Whistleblower Protection Act (WPA) also protects you.
While it is illegal for employers to retaliate against truck drivers who refuse to violate the law, or complain about violations of the law, it is sometimes hard to prove such retaliation took place. It is even harder to prove retaliation took place if you do not have a good lawyer on your side. So, if you believe that your employer is going to retaliate against you, or has already retaliated against you, you should contact an experienced employment lawyer who is knowledgeable about the STAA and Maine’s WPA.