When must a process server engage in 'due diligence'?

A process server must engage in 'due diligence' at all times to ensure that legal documents are served effectively and in compliance with the law. This ongoing commitment to due diligence is essential because it involves taking all reasonable steps to locate and serve the intended recipient of the legal documents.

Such diligence encompasses a variety of tasks, including verifying the correct address of the individual being served, attempting service at different times of the day, and confirming any information from reliable sources to ascertain the recipient's whereabouts. By practicing due diligence consistently, a process server minimizes the risk of improper service, which can lead to delays in legal proceedings or even dismissal of cases due to inadequate service.

In contrast, the other options imply a limitation to certain circumstances or conditions under which due diligence is performed, which does not align with the standard practice required of a process server. The continuous application of due diligence is critical, regardless of the time of day, type of document, or court instruction.