An American citizen should damn well know his rights without some cop having to tell him. If I cannot leave anytime I want to, it is an arrest. If I ask, "Am I free to go?" and Officer Friendly doesn't immediately answer in the affirmative then I will assume I am under arrest and act accordingly.
Not always. If you get pulled over for a traffic violation, for example you are usually not under arrest, but you are not free to go until after you've been released. Further, I believe there's a time limit in which you can be detained from leaving an area without an arrest being made. If you're held there longer it counts though.
Indeed it is. My point being, that if the brothers attained US citizenship under fraudulent circumstances, and it can be proven, the "enemy combatant" status is kinda a foregone conclusion.
I absolutely disagree.
Even with fraudulent circumstances, I still think a civilian trial is most appropriate here barring some evidence of acting under orders of a foreign military.
Ultimately, affording a civilian trial serves a great purpose. A civilian trial, unlike a military court or indefinite detention, holds those who have broken our laws and customs accountable before the highest authority and power that we have in our country: the people.
And there is no higher condemnation that we can give to heinous acts than to set aside the grand power of the state, and instead allow the people themselves to exercise our sovereign right to declare acts and behavior to be wrong, to be opposed to what we value, to be evil.