From talking to different immigration detainees, I'd heard stories of mediocre attorneys who preyed on those who hoped to stay in this country. Examples of some unethical practices by attorneys include refusing to accept collect calls from clients, lying about mailing copies of important documents to clients, taking money to represent a client knowing that he's not qualified for any relief, and making contradictory statements in court against clients.
Legal representation for those facing immigration deportation and seeking asylum is a big money business, especially after 9/11. When there is big money involved, there will always be corruption.
Beware of predators.