Let me just quote the first sentence of the article.
On any given night in Las Vegas more than 400 underage girls are used as prostitutes.
You know Las Vegas don’t you? It’s in Nevada, the state that has legalized prostitution in all but two counties. If someone was in Las Vegas and wanted to get themselves a prostitute all they need to do is drive one county over. Apparently legalized prostitution in Nevada hasn’t done anything to curb child prostitution. Go figure.