Long-time readers of The Japan Times will already be aware of some of the information in today's column. But within is an important update, so press on.
As you no doubt know (or should know), non-Japanese residents are required to carry ID 24/7 in the form of wallet-size "gaijin cards," nowadays known as zairyū kādo (resident cards). (People without those cards — i.e., tourists here for less than three months — must instead always carry a passport.) Don't leave home without yours, for you could face detention and a criminal penalty if a police officer suddenly demands it.
Which they can do at any time — underscoring the weakened position of non-Japanese under domestic law and social policy. According to the former Foreign Registry Law, any public official empowered by the Ministry of Justice may demand ID from a non-Japanese person, more or less whenever. Inevitably, this encourages racial profiling, as cops with systematic regularity target people who "look foreign" (including naturalized citizens, such as this writer) for public shakedowns that are intimidating, alienating and humiliating.