Call your Texas state bar and request a referral or try the avvo 'find a lawyer' tab.
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I can see how you lost the opportunity with this position, but are you saying that the prospective employer published the erroneous results within your industry? If so you need a strong PI lawyer who is experienced in defammation cases. You may also have a viable neglience claim for the lost opportunity with the entity performing the testing, although there are false positives and it is a shame that the employer did not recognize this.