That's one of the functions of the Federal Register. It applies the diffs so to speak to produce the actual code (by code here I mean law code). But yes in theo

That's one of the functions of the Federal Register. It applies the diffs so to speak to produce the actual code (by code here I mean law code). But yes in theory you can challenge that in court by showing they applied the changes incorrectly or something. And FWIW every once in a great while the government does tend to reset the baseline, declaring a specific version of the merged code as the single truth. So even if there are errors or whatever from previous applications of various bills it doesn't matter and courts can't examine that. This prevents every bit of law from potentially being subject to reconstruction from the first congress forward. I believe the current base revision is from 1986.