How do the judges intend to disprove Mary Warren's deposition in The Crucible?

The judges understand that Mary Warren's testimony seeks
to undermine the already determined conclusions of the court.  They fully understand
that her testimony will discredit the court's findings.  In addition to this, both
Hathorne and Danforth clearly see that she is unstable.  In Act Three, Scene 1, Danforth
remarks that Mary Warren "is not hearty, I see."  The fact that Proctor has to
physically prop her up and reminder her of the Angel Raphael's words to Tobias to
emotionally prop her up helps the judges understand that she is the weak link and if
they can break her down in front of the court, it will neutralize the threat that she
and Proctor pose to their findings and the court's standing in the eyes of the
community.  They start out to weaken her by asking her questions about her knowledge of
the penalty for lying and whether or not Proctor has put her up to this, as Parris had
already indicated that Proctor possesses another motive in trying to bring down the
court's standing.  After these rounds of questions, the judges bring in the other
girls.  It is unclear whether they recognize Abigail's power to coldly lie, but the
judges understand the power of bringing the other girls in front of Mary.  Already
weakened and already semi- discombobulaed in front of the court, the judges figured that
the catalyst for her ultimate discrediting would come if the other girls confronted her.
Indeed, it works as Mary begins to wither, Proctor becomes more animated, causing
Hathorne to question his veracity, and Abigail begins to "feel" the "cold wind" and in
the process, begins the process of marginalizing Mary, causing her to fall apart in
front of the court.  In this, Abigail accomplishes her end purpose of punishing those
who cross her and the judges are able to disprove Mary's
testimony.