Which of the following is NOT a reason for quashing a subpoena?

The correct reason for not being a cause to quash a subpoena is that it involves a personal matter. Courts generally recognize the importance of the legal process and the interests of justice, prioritizing the need for relevant evidence over personal privacy when it comes to matters related to subpoenas.

In contrast, there are valid grounds for quashing a subpoena when it fails to provide reasonable time for compliance, requires excessive travel for a non-party, or demands disclosure of privileged information. These concerns relate directly to fairness and the protection of individuals' rights and privileges. For instance, a subpoena that does not allow sufficient time may undermine a witness's ability to prepare adequately. Similarly, excessive travel can pose an undue burden on individuals, particularly if they are non-parties to the case. Lastly, protecting privileged information, such as communications between an attorney and client, is essential to maintain the confidentiality of sensitive matters. Thus, while personal matters may be significant, they are not sufficient grounds for quashing a subpoena in the context of the legal process.