It is not easy to deal with these swindlers who have returned to China. The police need to examine first, determine the identity and criminal facts, and then deal with them according to the degree of crime. Under normal circumstances, people suspected of committing crimes will be taken into criminal detention or administrative detention for a period of 30 days. But this does not mean that they can be released after 30 days, because some people with serious circumstances need further trial by the procuratorate.