This is an analytical and descriptive essay, but you need to think more about the analysis side. Talk about the background of trackers. Then talk about how the use of trackers by the police such as on cars have helped them in their investigations. Find scholarly literature such as court cases or examples in which the literature studies police practices before the use of trackers and after, and the impact that trackers have had in the use of police investigations. (For the sources only use scholarly articles)