One can't assume that PT POs "have limited authority" when not working. A lot depends on the policies of their chief and department.
When a good friend became Chief in a North Shore town (wealthy town with ~8 FT POs and ~8 PT POs), my friend researched the statutes and concluded that his Special/Reserve POs were under MGL POs 24x7. One day I stopped in to pay a visit and he wanted to show me the town. We went in my car and almost everything in town is 30mph limit. I was probably doing 35-38 and he warned me to slow down as he saw one of his Special POs (in his POV) and said he could stop and ticket me. I looked at him and said "are you serious?" and he said "yes, they do and have the authority regardless of whether or not they are working a shift".
In the town I served, some FT POs bitched about our existence until:
- Christmas, they all wanted it off and had us work (we got paid) the shifts.
- When they had policemen's balls (take that as you like
), they wanted us to work (we did get paid) so they could party. I used to attend the events instead when I was available.
- When a bad storm was predicted and Edison or Telco was stringing lines so they needed a police detail, or a gang had threatened to trash a private party, or a huge turnout was expected at an election (with rain predicted all day) suddenly no FT PO wanted the detail! [I know as I worked all of these events (paid)!]
- When 2 officers got married, they actually had the cajones to ask us to work for free and they would be "on the books" as working while at the wedding (and getting sauced)! I don't know if any of the 35 of us were stupid enough to do this, but I said NFW!
- A particular detective who hated our existence, used to bitch about us all the time, and he and I finally had it out one evening . . . when he retired he immediately signed up as a Special PO so he could do the details while collecting his pension! I'm sure that he doesn't see it the same way for HIM (and the other FT POs that retired) as he did for the rest of us!