Depends on where you are. I’ve completed police academies in both MA and PA.
Here in PA, part time officers have the same duties and same power as full time officers, they just do it less hours per week. There is one standard academy program for the state, and whether you want to work part time or full time, you attend the same academy for the same amount of hours. It’s extremely difficult to get a full time gig in PA without first having part time experience. The chiefs usually want to see what you’ve got before they offer you the higher pay, benefits, pension, and civil service protection. As a result, part time officers are regarded by their peers, the public, and the government as full blown cops, and not as weekend warriors or wannabe hacks. Chiefs around here usually like their part timers, because they’re usually the younger guys trying to earn that full time gig, and so they work their asses off.
In MA, it’s a little different. Their police training and certification system is, to absolutely nobody’s surprise, screwed up like the rest of the state. Full time municipal officers have to attend a 6 month, 800 hour full time academy (all day M-F). They also have a reserve officer academy that’s usually a few nights a week and runs about 300 hours total. The reserve academy teaches really only the basics of criminal and constitutional law, most of the other law classes are more FYI sessions, firearms training is optional, and there’s no emergency vehicle operation training. Needless to say, there’s a pretty big gap between the full and part time guys in terms of capabilities.
As a result, generally speaking, part time/reserve officers have less responsibilities than the full time guys and cannot work more than 40 hours a week (though they’re usually armed and have the same power of arrest). However, some of the really tiny towns actually have only reserve officers and they are expected to provide the full spectrum of police services (usually assisted by the State Police). That could have the case here.
So, in all likelihood, he was an officer with the full spectrum of duties who forgot that he only had reserve training and was driving way beyond his capabilities. He probably realized that the way he was driving and the result was going to be way past the “just tell the truth and you’ll be fine” threshold. MA is probably the hardest state in which to get a police job, and he knew he just flushed a winning ticket down the crapper. The problem is, even if he got fired, he MIGHT have had another shot somewhere else. Now, since he’s lied in an official capacity, he’s officially a Brady cop, and will never again be allowed to testify in any court.