[ndt]

"Presidents Lincoln and Roosevelt thought otherwise and the USSC agreed."

By Lincoln I assume you are referring to the suspension of habeas corpus which was ruled illegal in Ex parte Merryman.

By Roosevelt I assume you are referring to the internment of Japanese citizens, one of the darkest chapters in American history in my opinion. That was the result of an Executive Order (9066) and nothing like that exists in this case.

[investigateworld]

Correct as to Roosevelt.

So we are back to basics: Does probable cause exist to continue 'routine' questioning? Do the answers given coincide with what is all ready known to the investigator?
Why is their a focus on these two individuals.
How did they support themselves?

One reportedly worked as a cherry picker.... sounds like they don't come from money. If they don't want to answer the questions, well they can back door through Mexico (Hey a novel Idea!)