Mass. Gen. Laws ch. 131 § 87
The director of law enforcement, his deputy directors of enforcement, chiefs of enforcement, deputy chiefs of enforcement, environmental police officers and deputy environmental police officers, wardens and members of the state police in areas over which they have jurisdiction and all other officers qualified to serve criminal process may arrest without a warrant any person found violating any provision of this chapter or of any ordinance, rule or regulation made under authority thereof, or other general or special law relating to fish, birds, mammals or dogs, and may seize any fish, birds or mammals unlawfully taken or held, which shall be forfeited to the commonwealth and disposed of by the said director for the best interest of the commonwealth. Wardens shall enforce the laws relating to fish, birds and mammals. Any of the foregoing persons authorized to arrest without a warrant may, in the performance of their duties, enter upon and pass over private lands, whether or not covered by water.
Mass. Gen. Laws ch. 131, § 87