Which of the following actions is NOT considered obstruction of an investigation?

Allowing an agency representative to interview the juvenile is not considered obstruction of an investigation because it actually facilitates the inquiry into the juvenile's circumstances or behavior. When a representative is granted access to interview the juvenile, it indicates cooperation with the investigative process, which is crucial for ensuring that the juvenile's rights and needs are addressed adequately.

In contrast, the other actions listed impede the progress of the investigation. Refusing access to the juvenile, not allowing private observations, and preventing medical evaluations all obstruct the ability of investigators or agency representatives to gather necessary information. Each of these actions hinders the investigation and could prevent crucial data from being obtained, making cooperation, as seen in allowing interviews, a key element in supporting the investigative process.