Understanding the Impact of Retroactive Laws and Sign Regulations: A Comprehensive Guide

Understanding the Impact of Retroactive Laws and Sign Regulations: A Comprehensive Guide

Question from a reader:
Please tell me about retroactive laws. I believe that it is not possible to question the legality of actions that occurred before a law prohibiting them was enacted, but what about actions that “started” before the prohibition? For example, if a law or ordinance prohibiting “flashy signs” is enacted in Kyoto, must existing signs be removed and