Rockland Police officers were informed of the shocking behavior by another officer in August, and the two were fired in September.
According to court documents, Addison Cox, 28, and Michael Rollerson, 31, pleaded guilty in Knox Superior Court to charges of cruelty to animals and night hunting.
Rollerson told Main Warden Service investigators that he had killed eight fanged rodents, which he believed were a nuisance that caused the damage, according to The Bangor Daily News.
He was sentenced to 270 days in prison, but was suspended for 20 days.
He was also fined $1,000, placed on probation for six months, and must give up his Maine Criminal Justice Academy credentials.
Rolson will serve his prison sentence in January, court documents state.
Cox admitted that he had killed three animals and was sentenced to 90 days in prison, 10 of which were suspended.
He was also fined $1,000, cannot apply for a law enforcement job for six months, and must complete 100 hours of community service.
According to court papers, Cox will serve his prison sentence over the weekend.
Prosecutors demanded a hefty sentence for Rollerson because he was the senior officer and had killed more animals.
District Attorney Natasha Irving said prosecutors had agreed to drop the charges, partly because both men were military veterans who had seen active duty.
Rollsson previously told investigators that he suffered from post-traumatic stress disorder after serving as a Marine in Afghanistan.
Both men are now being treated by the Veterans Administration.
“It was a mitigating factor, that they both experienced war zones. Ultimately, I wish they never hurt another living thing again,” said Ms. Irving.
And she added: “I think in addressing the mental health component, I think it’s a really important part of it.”