How Does China Enforce Its One-Baby Policy?

Beijing makes an exception for couples where the husband’s brother is infertile and does not adopt a child and both husbands have rural residence permits. In Fujian a couple can have a second kid if the provincial population density is less than 50 people per .38 square miles, or one person per 11 acres at the time, or if each spouse farms at least an acre and a half of land.

Really interesting stuff