Cung's body is borderline imho but it's hard to see why he would put so much extra energy into his body now rather than earlier in his career when his body would have responded a little better to harder training. So, yeah, roids or something.
Regardless Bisping will likely tired him out.
I'm sick of the UFC's drug abuse. They even allow 4x normal test afaik, and guys are still way, way over

It's expensive to test for it, but the UFC could bind guys by contract. The UFC can test them at any time and if the athlete fails the test, then he pays for it, gets suspended, and must be re-tested at his own expense to return. It doesn't sound like much but I think it would solve the problem. And I get the feeling the UFC wouldn't lose much $ on it because they'd know who to test.