Most detectives are part of regular police forces. Special agents work for Federal and State law enforcement agencies. They file reports about what they've done during the day. Most police work on foot or ride in cars. Many, however, ride horses, bikes, or motorcycles, and some work in boats on rivers and in harbors.
Some police work with dogs.
When they work longer, they get extra pay. They have to be ready to go to work at all times. Police may work very long hours while on a case. Some special agents have to travel a lot, often on very short notice. Some police work outdoors in all kinds of weather.