Which hairstyle is explicitly prohibited for trainees in uniform?

The prohibition of pigtails for trainees in uniform is based on the need for a professional and uniform appearance in law enforcement, which reflects discipline and adherence to regulations. Pigtails can present a casual and unkempt appearance, which may not align with the expected standards of professionalism within the police force.

In contrast, the other hairstyle options—such as a single ponytail, braids, or a bun—can be styled in a way that maintains a neat and orderly look, adhering to dress code standards. These hairstyles can keep hair secured and away from the face, which is practical for individuals operating in various environments and during active duties. Thus, the specific restriction on pigtails highlights the emphasis on maintaining a polished and disciplined appearance in uniform.