I'm here to help you with your question. In Spanish, if you want to explain the part of law enforcement you want to practice and why you want to fight crime, you could say something like:
"Quiero ser parte de la policía investigativa porque me interesa resolver crímenes y hacer justicia. Creo que es importante proteger a la comunidad y ayudar a mantener la seguridad de todos."
This response highlights the desire to be part of the investigative police force to solve crimes and uphold justice, emphasizing the importance of community protection and safety.