Lab in SE Alabama may have forged resultsFrom Dale County AL: Ozark police continue to investigate reports of falsified drug and paternity cases involving a company contracted by the Department of Human Resources (evidently in Pike County), families are coming forward with claims forged documents impacted their homes... Seavers said Ms. Murrah (A & J Lab Collections) provided false positive drug tests, which prompted a judge to order restrictions on her access to her children - further complicating the custody battle... Seavers says because she knew she hadn’t been on drugs, she took a retest which came back negative and started looking into the original test results... Court records confirm Murrah pleaded guilty to fraud in 2013...
The article did mention both drug and DNA test results, so it may not be limited to drug tests.
Conclusion... In the rare instance you suspect incorrect lab results, no harm in using another lab for independent verification.