From the information you have provided it seems like you have to wait for a letter requesting information or a letter making an allegation before you consult with an attorney. I suggest that you wait until you have a better understanding of what is being alleged before you seek legal advice. It's possible that nothing will come of it.
This is really a criminal defense question - I will try to repost for you.
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If you believe you may have committed food stamp fraud the most important thing to remember right now is that you shouldn't make any statements to anyone about the case, your income, or the makeup of your household. Many times these cases are prosecuted based on statements and admissions. If you believe you are being investigated hire an attorney and direct the DHS investigator or law enforcement officer to your attorney.
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