First, I would have called over the supervisor immediately if a TSA agent rifled through my wallet. That's definitely not cool. And it opens them up to all kinds of troubles - you could say that the TSA operative took money, etc.

The SOP if you set off the explosives detection alarm is to collect your biographical data. The TSA (possibly in violation of federal law) refuses to say what is done with the information so there's no way of knowing what will happen. So far it doesn't seem to have been a problem for the couple people here on FT who reported having it happen to them.

If it were me, I'd write several letters in response to this. First to the FSD of the airport and whomever the TSA's customer service contacts and ombudsperson are asking what's going to happen with this data. Second to my congressional reps asking them to look into whether the TSA is required to comply with the Privacy Act and any other federal legislation in this area, and, if not, demanding that new legislation be introduced post haste to protect your privacy.