Withholding information on this forms is a federal crime punishable with up to 5 years in prison. (Up to 8 years if related to terrorism.)https://twitter.com/nytimes/status/885556963500752896 …
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So for most cases it's an impossible defense. Except maybe if you can prove that you got wrong advise from a lawyer.
... at least that's how it works in Austria. The legal term for that is "Rechtsirrtum" (§ 9 StGB). In Germany it's called "Verbotsirrtum".
