Anyone familiar with the PSB will not be at all surprised. One friend of mine (while I was a student there) told me a story about how he had gone out to bars with the head of a minor Chinese sports team and his friend, the head of the PSB in Shanghai. At every single bar they were offered all the food and booze they wanted, free of charge. At the last bar, they were also offered whichever waitress they wanted to take home.
There is likely some kind of politics behind this particular arrest (though it will be impossible from here to figure out the connections).