Are U.S. citizens being illegaly detained by local, state and federal authorities?

In a drive to crack down on illegal immigrants, the United States has locked up or thrown out dozens, probably many more, of its own citizens over the past eight years. A monthslong AP investigation has documented 55 such cases, on the basis of interviews, lawsuits and documents obtained under the Freedom of Information Act. These citizens are detained for anything from a day to five years. Immigration lawyers say there are actually hundreds of such cases.
"The more the system becomes confused, the more U.S. citizens will be wrongfully detained and wrongfully removed," said Bruce Einhorn, a retired immigration judge who now teaches at Pepperdine Law School. "They are the symptom of a larger problem in the detention system. ... Nothing could be more regrettable than the removal of our fellow citizens."
It's impossible to know exactly how many citizens have been detained or deported because nobody keeps track. Kara Hartzler, an attorney at the Florence Immigrant and Refugee Rights Project in Arizona, testified at a U.S. House hearing last year that her group alone sees 40 to 50 jailings a month of people with potentially valid claims to citizenship.
The program came under fire partly because it gives local officers so much leeway to decide who to stop. Almost one in 10 Hispanic adults born in the U.S. report that police or other authorities stopped them and asked about their immigration status in 2007, according to a Pew Hispanic Center survey of more than 2,000 people.

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