As a Detective, you should be focused, decisive, and know what you want. Show the interviewer that you are capable of utilizing these traits and discuss where you are determined to take your career.
"My career goals as a Detective include being the top of my unit and advancing through the ranks quickly. I plan to be an example to those around me on strong communication, leadership, documentation and integrity. I would, of course, like to become Captain one day and understand the work required to get there."