Interview Waiver Program - eligible but still called for Interview

[Anurag Mohanty]

My parents were scheduled for an appointment at the Visa Application Center, both of them qualified for the Interview Waiver program. So they provided the passports, confirmation, DS 160 and everything else required at the VAC, were ten printed and they were asked to go back. We assumed that they would get their passports stamped and sent via bluedart. However after reaching their hometown, my father was called by the US Consulate and requested to appear for an interview. Curiously though it was only him who was requested for, not my mother. I have 2 questions.

1. Any idea what this interview might be for, since the interview waiver applies to them..? they as well as I are a little anxious.. to my knowledge all documentation was immaculate..
2. Since this is an unscheduled appointment at the consulate, and my father doesnt have a scheduled appointment confirmation letter with him, how would he be admitted inside the consulate..?

I would deeply appreciate a quick response to this..

[peace999]

If you read about the interview waiver program on US embassy website,
it clearly states that any one eligible for an interview waiver can later be called for an interview
if the embassy requires. So it should not be a surprise. And nothing to be anxious about.
There have been posts of kids under 14 applying under the interview waiver , being later called for an interview
with their parents.

How did he use his past visa? Did he visit US too frequently or stay there long periods or applied too many extensions?
if yes, that could be the reason . Or since he is being called without his wife, something in relation to his occupation
could be the reason.