I have way more than a clue, cholo. You're lecturing someone with formal law school training in immigration law. Immigration officers aren't free to exercise whims and intuitions in deciding whether to admit a visitor; they're bound by regulations, policies, and precedents, and their decisions are subject to oversight, reconsideration, and appeal. "Suspicion," whether plain or simple, is just that: unsubstantiated suspicion. Suspicion can warrant higher-level interrogation and investigation, and in some cases a reasonable period of detention -- but, ultimately, there must be a showing of good cause for denial of entry if, as in the case of this Australian visitor, she had previously sought and been granted permission  to visit our country. Based on the facts related in the news story, there was no such good cause.