Based on some of the questions you have listed, perhaps there is someone with a name similar to yours - or someone who shares your name - that they are looking for.

Every time I got pulled aside during the period I was flagged, most of the questions dealt with my identity and to a lesser extent finances (what do you do for a living, who do you work for, could I see your business card, etc).

As far as identity questions, where do you live, who do you live with, where have you lived in the past. To an extent, some of the financial type questions could fall under the identification category.

Given my credit file was pulled by the child support division (I have no children) from a law enforcement agency in Michigan that leads me to believe they were looking for someone with a same or similar name. If it was close enough for the police to pull my credit file, I'm thinking this same info may have been accessed by US Immigrations and flagged me each time I re-entered to make sure I was not this person.

When the consistent secondaries stopped, I figure they either found who they were looking for or that I simply had entered enough times, gone through secondary with negative results each time, that US CBP simply concluded I was not the person they were looking for.

When I spoke with law enforcement up in Michigan where my credit report was pulled, they removed it and claimed it was a clerk / data entry error. I don't buy this because my father's credit report was also pulled by them. We share a middle and last name - other than that, significantly different SSNs, different addresses, employers, telephone #'s etc. Another clerk error?

To me, it seems like they were data mining to locate someone and didn't have full/accurate info, as such the secondaries during re-entry were a part of that dragnet.

Check your credit files and conduct some searches to see if someone with a similar name is perhaps wanted. Very frustrating, but I'm glad I no longer have to deal with it.