Today, series and movies compete for who breaks boundaries, who is the boldest. In the early 2000s there were oz, wire and sopranos who were pioneers. At the latest, breaking bad set a new frontier for storytelling - which may never have been broken - but in general, even at the time the shield came, tv shows was quite cautious about the fear of rejection by production managers and the media. With good reason, one can think that the shield is the ancestor of many good drama series, a forerunner. The third season is the best so far: the plot, the actors, the description and the realism are at a level that will suit any program today