I realize I'm not adding anything new but here's my thoughts:
1) There's nothing wrong with politely asking
2) Anything more, such as threats, demands, and forcable entry are completely wrong.
A warrent is required if the homeowner doesn't acquiesce to a polite request.
However, knowing what its like on the border (I live in Phoenix AZ, and had a good friend that lived very close to the border) things can get very isolated. I wouldn't be surprised if a government agency used that isolation to intimidate or bully a homeowner to get their way. And because of that I'd expect some very high levels of attention in the oversight of ATF that is running this program.
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