Blood Gallstones?

My mother had some gallstones removed yesterday and will likely have her gall bladder removed today. According to Wikipedia, there is quite a market for gallstones; especially in China:

"Gallstones are a valuable by-product of meat processing, fetching up to US$32–per–gram in their use as a purported antipyretic and antidote in the folk remedies of some cultures, particularly in China. The finest gallstones tend to be sourced from old dairy cows, which are called Niu-Huang (yellow thing of oxen) in Chinese. Those obtained from dogs, called Gou-Bao (treasure of dogs) in Chinese, are also used today. Much as in the manner of diamond mines, slaughterhouses carefully scrutinize offal department workers for gallstone theft."