They may have an opening today, and then you are gone in 60 days due to monthly budgeting cuts.
This is especially dangerous in Tex. with an at will employment contract. A offer of employment is not worth any more than the day it was written.
Interviews are initially provided by typical head hunters, with no knowledge or experience. Say a lot to get their attention and prove your self (if you do not know some one or have family inside the company). That's the only way you get a final interview with the person that matters.