According to WhatCulture.com, “Dexter managed to cause an international incident thanks to an off-hand remark in one episode which stated that Adelaide, a city in southern Australia, had the highest serial killer count per person out of any place in the world. It may or may not actually be true, but it’s a widely-reported bit of grizzly trivia.
Regardless of any factual basis, the South Australian government filed complaints against the local Fox affiliate that aired the show in the country, and adverts around the country promoting the then-current season were pulled from billboards, newspapers, magazines and TV screens as a result. Sure are sensitive, those murderous Aussies.”