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Your lawyer do not have to be in DFW area in that matter is concerned, it also does not make any difference if it is in DFW or in anywhere in the USA. You need to pick a lawyer who knows immigration law (eventhough it so hard nowadays as the rules are changing everyday) and responds to your question in a timely maner.There are a lot of lawyers they talk very nicely utnil he/she gets your contract then they will just ignore you. I can suggest LOSM, RAJIV,SHUSTERMAN, OH are nationwide professional immigration lawyers.
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