quadraginta
Becoming Beth
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In America, witnesses are indeed afforded attorneys during questioning if they ask for one, and they cannot be held against their will unless the police charge them with a crime.
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In the U.S. witnesses are not "afforded attorneys during questioning if they ask for one". They can request that their attorney be present during such questioning, but there is no obligation for the state to provide one. So that part is wrong. For that matter even formally charged suspects are not just afforded an attorney. They can demand that their own be present, or subsequent to a determination of indigence, they can have one provided.
As far as whether or not witnesses can be held against their will, all I can say is do some research on "material witness" statutes. Not only can they be, but anyone who has been watching the news since 9/11 should be fully cognizant of the fact that they are.
This doesn't even touch on the thousands of cases where LE detains people for interrogation without bothering with petty things like warrants in the U.S., generally with impunity, because the
Chicago Tribune
September 10, 2002
A federal judge on Monday ruled that Chicago police and Cook County prosecutors have routinely violated the rights of witnesses by denying them access to lawyers while holding them for long hours in small, locked interrogation rooms.
In a sharply worded opinion, Judge Milton Shadur of U.S. District Court in Chicago issued a wide-ranging injunction ordering Chicago police to begin allowing lawyers to see the witnesses immediately. To verify police compliance, the attorneys must be present when police tell the witnesses they have arrived, Shadur ordered.
Shadur, who in the past has issued rulings critical of Chicago police, wrote Monday that while in theory police treat witnesses and suspects differently--saying witnesses are free to leave the police station while suspects are not--"that pristine theory is totally at odds with actual practice."
"No reasonable person," the judge wrote in a 41-page opinion, "would knowingly volunteer to remain in a small, windowless, locked interrogation room for such extended periods of time."
Shadur said holding witnesses--particularly those who are poor and ignorant of their rights--is often a pretext to questioning them as suspects and sometimes leads to violations of their constitutional rights.
I'll let you exercise your own research skills to find more examples. There are plenty out there. Compared to the U.S. Knox's treatment in Italy seems to be a stellar example of professionalism. Maybe we should be learning from them.
That's two abject fails in the same sentence. Not bad for a newcomer.