《明史·志·卷六十九》
所谓疏放，就是引犯人来到宫外御桥上，叩头完毕，送到应天府，发放通行证，释放回家团聚。
疏放者，引赴御桥，叩头毕，送应天府，给引宁家。
The so-called shufang meant that the prisoner was led to the imperial bridge outside the palace, knocked his head, and was sent to Yingtian government office to issue a pass to release him to return home for reunion.