Yes, Arapahoe County Sheriff's Office is in charge of enforcing laws for the city of Centennial. I agree, citing people for turning on the double-yellow is legit, however, handing out a "Fireworks are bad" lecture is bullshit. When I was a cop, they got the ticket, explained it to them and left...done. Doing anything more than that almost always guaranteed a complaint. Regardless, I hope you had a good day.