What evidence is used to support Abigail Williams's assertion that Elizabeth Proctor is guilty of witchcraft?

The main piece of evidence that is used to back up Abigail
Williams's claim that Elizabeth Proctor is a witch is the "poppet" that is found in
Proctor's home.  This is a doll that Proctor has allegedly been using like a voodoo
doll.

Abby says that Proctor has used the doll to bewitch
her.  She screams with pain and says that Proctor has done something to make her stomach
hurt.  When the men go and find the poppet and Proctor's home (it was put there by Mary
Warren) they find it has a needle stuck in its stomach.  This is the proof they need to
arrest Proctor.