Which government policy, intended to regulate society, is used in both North Korea and China?

Bans against smoking

Censorship of free speech

Unrestricted travel vouchers

Limitation of one child per family

It is The limitation of one Child per Family.

Explanation:

Its that answer because, North Korea and China wanted one Child per family, if The family went over that extent they would kill the other children or give them up to someone or somewhere else, and let the family only have one.

Which government policy, intended to regulate society, is used in both North Korea and China?

The limitation of one Child per Family.