Question:
Based on the premise "Isn't it possible that, as Inglethorp brought him through the hall, the doctor dropped something into the coffee in passing?"", can we conclude that "The coffee may have been laced by the doctor."?
****
Answer:
it is not possible to tell

Question:
Based on the premise "Have you?", can we conclude that "Will you?"?
****
Answer:
no

Question:
Based on the premise "When the United States runs a trade deficit, foreigners buy less than a dollar's worth of U.S. goods and services with every dollar they earn on their exports sold to the United States.", can we conclude that "When the United State runs a trade deficit, foreigners buy less U.S. goods than they earn on exports to the U.S."?
****
Answer:
yes