You may be referring to 26 MRSA 601, which states "an employee may be employed or permitted to work for no more than 6 consecutive hours at one time unless he is given the opportunity to take at least 30 consecutive minutes of rest time, except in cases of emergency in which there is danger to property, life, public safety or public health. This rest time may be used by the employee as a mealtime." As you note, there is an exception for employers where there are fewer than 3 employees on duty...