Seat Belt Violations: Seat Belt Violation in Another Atate

My question involves a traffic ticket from the state of: Georgia

While my family and I were traveling to Michigan from Florida, we got pulled over in Georgia. The police officer told us my seven year old sister needed to be in a proper child seat but in the state of Florida you only have to be in a seat if you are under five. But in Georgia you have to be in a proper seat if you're under eight.
My question is... can a police officer give out a ticket based on that states law if they're from another state and only passing through?

Seat Belt Violations: Seat Belt Violation in Another Atate