What is a potential requirement for a private detective to maintain their license?

To maintain their license, a private detective is often required to engage in ongoing professional development, which is typically achieved through continuing education. The requirement of completing 40 hours of continuing education every two years ensures that private detectives stay updated with changes in laws, regulations, investigative techniques, and ethical standards relevant to the profession. This continuous learning process is crucial for maintaining a high level of competence and professionalism in the field of private investigation.

The other options, while they might appear relevant to licensing requirements, do not encapsulate the broader professional development aspect emphasized in the correct answer. For instance, bi-annual reports or monthly activity logs could be administrative tasks but do not directly contribute to the professional competency of the detective. Similarly, while fees might be associated with renewing a license, they do not reflect the necessary growth and education that a continuing education requirement would entail.