Which issue arises from failing to provide necessary supervision during trainee evaluation?

Failing to provide necessary supervision during trainee evaluation creates the issue of inexperienced personnel. Effective supervision is crucial in a training environment, particularly in law enforcement, where practical skills and decision-making capabilities are developed. Without proper oversight, trainees may not receive the guidance and feedback they need to refine their skills and knowledge.

Inexperienced personnel can lead to various problems, such as inadequate responses to critical incidents, lapses in protocol adherence, and an increased likelihood of errors that could have serious implications. This lack of experience can hinder the trainee's ability to perform confidently and competently in real-life situations.

Additionally, while other options such as undefined objectives or engagement levels may be correlated with insufficient supervision, they do not directly speak to the immediate consequences of inadequate oversight in terms of the trainee’s practical skills development. Therefore, inexperienced personnel is the most accurate representation of the major issue resulting from insufficient supervision during the evaluation process.