History:
Lots of things affect how surnames spread. People also move voluntarily—for jobs, religion, or other reasons—and tracing these movements needs detailed family records, which are often missing or incomplete. This surname probably changed slowly over time, maybe due to spelling mistakes or nicknames.
Description:
Unlike surnames with deep roots in certain places or communities, "Police" is a fairly new name, stemming from its job meaning. Where this surname is found probably just shows where police forces are and who chose it, maybe as a chosen name or because of their job. Its unlikely to tell you much about someones family history like other surnames might.
