In Law & Order, the detectives from the 27th Precinct work in a Detectives Squad, meaning that not everyone in that squad is a homicide detective. In a city as large New York City, there can't be just one unit responsible for handling all the murders that take place in that town. That's why they have detective squads in New York and LA. Yes I am aware of the infamous Robbery Homicide Division in LA, but there are also detective squads located in different precints throughout the city. (Read Micheal Connelly's earier Harry Bosch Novels.) So who ever is running this Wikia, please change that about the 27th precinct and the detectives, who are Homicide detectives part of the 27th's Precinct's Detectives Squad.
And Just a Tidbit for the fans:
Real life NYPD SVS does not investigate murder, robbery or child pornogrophy. If there is rape or abuse of a child(ren) or the elderly, then SVS may assisst. Child pornogrophy is investigated by NYPD's Vice Enforcemnt Sexual Exploitation of Children Unit. But everyone who does not post youtube videos or comments asking other people to do the research for them, would already know this. :D