In May, Gov. Charlie Baker instituted a mask requirement on public transit. Ignoring the state order can result in a $300 fine per violation. The federal order from the CDC calls for the public transit operator to refuse admittance to those without a mask. Operators of public transportation conveyances must refuse to board anyone not wearing a mask that completely covers the mouth and nose and require that everyone on board wears a mask for the entire duration of travel. If a passenger refuses to comply, the operator must disembark the person at the earliest safe opportunity, according to the CDC order.