Premise:
"every once in a while down here at the main site"
Hypothesis: Nothing ever happens at the main site.

no

Premise:
"Such information may be provided on a need-to-know basis only to persons authorized by law or regulation to receive it."
Hypothesis: The process to be legally authorized to receive this information, is a lengthy one.

it is not possible to tell

Premise:
"Similarly, the American Heart Association's official recommendation advises, If you drink, do so in moderation."
Hypothesis: The American Heart Association encourages drinking to oblivion.
no