The Church uses Cain justification in black ordinations in Brazil.
Lineage Lesson, LR 959 21, Church History Library
For this reason the gospel is not actively taught to the lineage of Cain. The prophet has told us to preach the gospel to those who are entitled to the priesthood.
Missionaries serving in Brazil used this lesson to teach those Brazilians believed to have African ancestry about the priesthood limitations that would be placed upon them upon conversion.