The whole story doesn't seem to add up, I have a feeling that some crucial information is missing. Apparently, the reason she was sent home was that she gave w

The whole story doesn't seem to add up, I have a feeling that some crucial information is missing. Apparently, the reason she was sent home was that she gave wrong information about her reasons to enter the country. That's why she was confronted with contradictory information in her messages (she claimed she wanted visit friends of her parents, while she was really going there to work). So was she actually trying to enter illegaly and was sent back because of that? That sounds like a visa issue to me (tourist vs. work visa). Certainly the NSA or Homeland Security or whoever weren't reading every facebook message just so they could check if the girl would state a matching reason for entering the country. To me it looks like something else must have triggered all of this, something that is not mentioned in the article. I understand that the main point here is that Immigration had access to her facebook chats. I just wonder: at what point in time did they decide to access her chats. Was it when the girl was already at Immigrations? Was it as a (random?) background check when she applied for her visa or ESTA? Or was it after something, e.g. keywords, in her chats triggered a check? (Please understand that I'm not in the slightest trying to defend that customs had access to the FB chats, I just find the article a bit lacking.)