“Don’t talk tell Mr. Verres about this. He’s been telling the government everything he can about you and your friends. The last person he found with this spell was strong-armed into government work.”
THESE ARE NOT MINOR DETAILS, DARN IT.
It was at roughly this point that some people concluded that Sarah could accurately simulate conversations with people while using the spell. She can’t. She could presumably simulate talking to someone, but it’d be her imagination putting word in their mouth. Potentially fun, but not a way of getting reliable information.