What motives does danforth have to discount the testimony of giles corey, john proctor, and mary warren?

Danforth needs to approve his activity and additionally the witch court by discovering witchcraft in individuals. Obviously, no one is a witch, however, Danforth needs to discover them to keep his activity and power. 
Mary Warren is in court since Proctor needs her to tell the court reality and free his significant other. Danforth is suspicious on the grounds that this is the principal he knows about this and he doesn't trust everybody could have lied. Mary discloses to Danforth that she was lying and that the greater part of the young ladies is lying.

Where's section one?