The point is the inconsistent enforcement of laws. And you can be assured that if someone was wealthy enough, the laws don't apply to them. I think that's what the author was talking about when he said 25 people who had tested positive for drugs were let go and not held. They were probably connected somehow, or paid a bribe. China is an incredibly corrupt country where bribes are standard practice. (Source: Bribes the Unspoken Rule in China: http://www.forbes.com/sites/richardlevick/2015/01/21/new-dat... and Corruption Index: https://www.transparency.org/cpi2014/results )
Moreover, their inconsistent enforcement of the law is why they have such a shitty environmental record/problem. China has laws on the books regarding pollution and the environment comparable to that of the U.S believe it or not. But they do not enforce any of them. They don't have the equivalent of the EPA who's sole job it is to go after offenders. Some inspector shows up wanting to see your carbon scrubbers on your exhaust towers? "Oh, I must have forgot your birthday, here's a wad of cash. See you next year." I witnessed something shockingly similar to that happen on a plant tour in 2013. I was dumbfounded and speechless. The plant manager thought it was a big joke.
I have nearly 2 dozen unique stamps in my passport over the last 15 years. China is the only stamp I will never have a duplicate of. I've been to some pretty bad areas and countries and China's wasn't "I fear for my safety bad", well, if I'm being honest it was a little, but I like that. It's exciting. No, it was "Holy crap this culture is complete backwards and toxic." People care very little about their fellow man/neighbor and I was disgusted by it. It seemed like everyone was trying to pull a scam on everyone else. I felt slimy watching it happen.