I hope you take some time and think through what you just said.
Now, what you just said IS accurate in the sense that that is exactly what he needs to do under the current system. But consider whether this makes any rational sense.
It is utterly impossible to prove oneself innocent when you are not actually being accused of anything. In this case the government has targeted him for detention and harassment by placing his name on a "secret" list for "secret" reasons. Depriving him of several of his basic rights without actually accusing him of ANYTHING.
In theory he could be on this list because of his wife. Or because of something he did. Or because his name is similar to someone else's. Or because he pissed of a TSA agent once. Who knows? It's secret! Even the fact that he's ON the list is secret.
Now, it's his job to prove himself innocent of... something! or, everything?
Good luck to him!
I know it is crazy to think about, but how does a felon who does the time, get out of jail and have to prove that he should have his civil rights back? Can he stand in front of a panel and say, I'll never sell crack again? How do you convince a panel that you are no longer a threat?
This guys is in a similar boat and although it sounds tough, he could take some reasonable steps to help his case through. Especially if in front of a jury, he could come out looking squeeky clean. I would recommend that he shaved his beard and maybe let his wife go on a vacation until the trial is over.
BTW, what can a court do for him if he is found innocent? Can they force the DHS or the FBI to take him off the list? It will be a really interesting trial to look into as it unfolds.