I am afraid it's iossble to get a detailed explanation here as each bar has its own consequences and requirements to overcome it. Generally, if a person applies within the time when the bar is applicable the visa will be denied, and the person found inadmissable.
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I agree with my colleague. You should consult with a reputable Immigration attorney so that the person's complete immigration and criminal histories may be evaluated to determine what the options are, if any.
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Immigration records do not get erased.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.