If a mtr is filed you will be entitled to a contested hearing and to enter your second test result into evidence. You may want to go ahead and hire an attorney now to approach the judge with this information in an attempt to cut this off at the pass.
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I agree with Ms. Jaggers.
I would add that when you get a lawyer, discuss getting a "hair" test privately.
Tests arranged by criminal defense lawyers for their clients generally are covered by attorney-client and work product privileges. For this reason, you need to get the lawyer, and then get advice about the test and these two privileges from that lawyer based on your specific situation. DO THIS NOW!
Answers on Avvo are for general information purposes only and should not be relied upon as legal advice. No attorney / client relationship is created by providing this answer. For specific advice about your situation, you should consult a competent attorney of your choosing.