Why does Cheever want to confiscate Elizabeth's poppet, and what is significant about the poppet?
Cheever takes the poppet because when he looks closely at it he discovers a needle stuck through the belly of the doll. At dinner that evening, Abigail collapsed from pain, and it was discovered that she had a needle stuck in her. She claims that it was Elizabeth's spirit that attacked her. The poppet is going to be evidence.
Proctor forces Mary Warren to reveal that she made the doll and therefore left the needle in it. But, as Proctor's anger grew, it was impossible to avoid the warrant. It had been sworn out for Elizabeth, and he could not stop them from taking her.
Abigail has set Elizabeth up to make it seem as if Elizabeth is practicing witchcraft on the doll to affect Abigail.