Premise:
"Is Leuchter a raving anti-Semite or a pathetic pawn who thrived on having--for the first time in his life--a bit of celebrity?"
Hypothesis: Leuchter is a little bit famous.

yes

Premise:
"Here is a man, let us say, who sets out to poison his wife. "
Hypothesis: This man deserves life in prison or worse.

it is not possible to tell

Premise:
"I think "I am sure "he cared for me at first. "
Hypothesis: I am certain that he did care for me at first.
yes