The interviewer would like to know the driving forced behind your choice to be in law enforcement. You can give an answer that allows some personal insight if you wish. The interviewer must see that you have a passion for this career path! Your passion is what will keep you in this role for years to come. Show the interviewer that you are committed.
"I grew up with a father in law enforcement and it was a career path that I always knew would be mine one day. Growing up, I loved to see the pride in my dad's eyes when he came home after a shift. I heard stories of him helping people and taking steps to make our community safer. I want to do the same."