The Communications Cable and Connectivity Association (CCCA) recently released a white paper explaining contractors may be found liable for installing counterfeit or noncompliant cable:
"The Communications Cable and Connectivity Association (“CCCA”) has found that certain imported communications cable does not comply with National Electrical Code (“NEC”) standards. Contractors that install this noncompliant cable, whether known to the contractor or not, may be exposed to liability for violating applicable building codes and in civil lawsuits for damages caused by the installation of noncompliant cable. Background about this issue and an overview of potential liability are provided herein."
The CCCA's full article can be read here.