I seriously doubt that you've done nothing wrong. The USC has over a million pages of laws: it's gotten to the point where our law-makers and law-enforcers themselves are no longer aware of all of the possible ways to break the law. And it's because of this volume that it has become impossible to live a day-to-day existence in the US without breaking some law or another.
Here's a great example:
- 16 USC 3370 (summary)
- It is unlawful for any person to import, export, transport, sell, receive, acquire, possess, or purchase any fish, wildlife, or plant taken, possessed, transported, or sold in violation of any Federal, State, foreign, or Indian tribal law, treaty, or regulation
That's a quick summary of the Lacey Act, for those who aren't already familiar with this very broad federal regulation.
There are many such overbroad laws like these in the USC, this just happens to be one of the most famous. With laws like these on the books, it's hard to avoid breaking the law. According the Lacey Act, it's at least a $10,000 fine to possess a lobster under 10.5 inches anywhere in the US; coupled with the Conspiracy Act, it's a federal felony to plan possession of a lobster under 10.5 inches with at least one other person. I don't know if you've ever had a small lobster, but there's a good chance you've managed to break the law somewhere in the world with regards to animals or plants, and that's all it takes.
My point here is that the intention of the authorities isn't to "catch the bad guys", it's to manufacture them. Everyone is guilty of something, the feds just need broader, more invasive access to discover what that something is.