[ContraryMary]

So how do we swear the cop to enforce the laws of the Commonwealth of Pennsylvania and then tell him that he can only enforce them in this area?

You're missing the point. It depends on the laws of the particular state.

[sig226]

I am not missing the point. Unless the state passes a law that prohibits police officers from enforcing laws anywhere other than their own town, the officer gets to enforce state laws. I am surprised that no other state has used this argument in its own appellate court.