UFC steroid testing policy a joke?

Is it me or does it seem like that they run a don't ask don't tell steroid testing policy in the UFC? It seems like if there is a suspect fighter but that fighter is a big crowd draw or one of Dana's golden boys i.e. Lesnar they don't bother testing. It seems they only test fighters on their way down i.e. Bonnar or fighters that people are indifferent to i.e. Sherk.