You need to stop posting this very same question over and over.
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It sounds like your case is loaded with constitutional rights deprivations; from unlawful seizure to 5th amendment Right to Silence. I would hire an attorney sooner rather than later, but I think you understand that already.
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You should definitely hire a criminal defense attorney. Someone who specializes in criminal defense in the jurisdiction in which all this took place. Obstruction of justice is a serious charge and in DC it is a very broad statute.
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