Found out recently that that a law enforcement officer cannot compel you to provide identification unless you're reasonably suspected of having committed a crime. So if you're minding your own business and a cop comes up to you and asks for ID, you are within your rights to just provide a name and address. You do not have to show him your IC. If you provide an overseas address, then you may be placed under arrest until it can be verified. (CPC, Sec 33-3).