More on Baptism

When one comes for Baptism, why do most Churches vote on whether or not to Baptize them? Where did this come from? Is it scriptural? The Church holds the authority, but must the ordinances of the Great Commission be voted on? If so, why not vote on winning souls, or partaking the Lords Supper?

Baptism

Why do true baptist,rebaptise?Why would a church rebaptise a beleiver who has been previously baptised,by immersion,by Rick Warren?