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I had used this once last year and it was fine. I pulled a report from Experian a week ago with no issues. I recently tried to pull on from Equifax and that requested I mail in with proof of ID. Googling the issue and it is not uncommon for them to ask for identity verification.
Err... the FACTA site is http://www.annualcreditreport.com/ , not "freeannualcreditreport.com".
Be careful.
I've never had problems but there are certainly others who have. Don't overlook prior discussions as a resource:
IIRC the security questions are pulled from your reports so if you can't get through security then check your reports. You can always contact a CRA directly to address this sort of thing. I don't recall if any of the CRA's use other data sources for the security questions but, again, you can call.