Do most users of TrueCrypt/VeraCrypt use this "hidden volume" functionality, or do they just want the basic full disk encryption? It wouldn't surprise me if users of plausible deniability were in the minority.
If you could show that most users never do this, you might have an argument in court. How would you do this though?
At the end of the day, the fact that you have this sw installed will make it fair to infer that you are using this feature. You can disagree, but it's what the courts say that matters here, not what I say.
