I've never seen an anarchy system have police response. There would need to be crime reported for that to occur. I've killed countless passenger ships in these systems and have never seen an authority vessel responding to it.
Why would authority exist in anarchy? It seems to defy the definition of disorder and non-recognition or absence of authority.
From ED Wiki (or whatever it's called)
A
star system with a controlling Anarchy
minor faction allows crimes to be committed without consequence. The system security level is also set to Anarchy, there are no
System Authority Vessels present, and no ship will show as "wanted" unless scanned with a
Kill Warrant Scanner. Anarchy minor factions are usually criminal organizations with internal arbitrary rule systems that do not apply to outsiders. Traders and travelers passing through Anarchy systems should be wary of interdictions and unprovoked attacks. Conversely, many combat-oriented pilots travel to Anarchy systems specifically hunt other ships without penalty.
Uninhabited systems are also classified as Anarchy systems as even though there is no trace of civilization, security forces have no reason to be stationed there or patrol the area.