GSP's saying what everyone already suspects or pretty much knows, but the fact that a fighter of his standing is coming out and saying this is massive news. Of course there are a lot of fighters who are using banned drugs but haven't been caught. Most testing is done right around the time that a fighter is fighting, so passing the tests when you know when they're coming isn't exactly difficult. Clearly the UFC could do more, but more testing is only going to hurt the company financially. So why would they?
I don't think anyone here mentioned his comments about fighters being afraid to speak up. It's another obvious thing that isn't a surprise but again it's big news coming from someone like GSP. The UFC focused on the monopoly part which they technically aren't. The issue of fighters being afraid to speak up wasn't addressed though.
In the past it was probably a 50-50 split on whether I liked Dana White's rants, half the time I agreed with what he was saying and half the time I thought he should shut up. Now it's swinging a lot more in the just shut up direction. At UFC 167 he said that GSP owes it to the UFC and fans to fight Hendricks again and now he's telling GSP to be a man.