In my case (Austria, EU), when the police is required to check your identity, and if you aren't carrying some allowed form of identification (id card [most people don't have one around here, no one needs it but it costs as much as renewing your passport], passport [who carries their passport around, might even be expired], drivers license [you might not have one]) they have to follow you home or wherever an recognized identity document of yours may be (e.g. some people store them at a safe deposit box at a bank).
In my case (Austria, EU), when the police is required to check your identity, and if you aren't carrying some allowed form of identification (id card [most people don't have one around here, no one needs it but it costs as much as renewing your passport], passport [who carries their passport around, might even be expired], drivers license [you might not have one]) they have to follow you home or wherever an recognized identity document of yours may be (e.g. some people store them at a safe deposit box at a bank).