Originally Posted by
Xiaotung
I got pulled over once by police driving from Merida to Campeche, asking for registration, licence and passport for both me and my wife. The cop also insisted my wife provide a licence but I told him she doesn't drive. He asked twice more even after I told him that, which I found pretty strange. Are they intentionally looking for trouble? I don't know. He let us go after we showed him everything we had.
Sorry for going OT, but my guess, and it's only that, is that the cop was fishing for a bribe and perhaps figured that if you figured you were doing something wrong under local law (not that you actually were doing so) he'd be able to secure one from you.