Do you re-read the source code for your keyboard drivers each time you boot up the PC? If not, how can you as a mere mortal be expected to understand if some keys still work the same as yesterday?
No, but when I'm in project folder and I'm not sure if done source file is still used somewhere, I type "banana" in it and hit compile. If it passes it's not used. I would have to break law to test this in law, that's ridiculous.
Does your country not have a set of books or a website where the law is published? Mine has a complete set of current laws published online, if it's on there then it's current law, if it isn't then it isn't. I don't see why finding out what the current laws are is such a problem.