Sentence 1: Use of Program Oversight

Sentence 2: Overseeing the program.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: While GAO has evolved over the years, its current mission is GAO exists to support the Congress in meeting its constitutional responsibilities and to help improve the performance and accountability of the federal government for the benefit of the American people.

Sentence 2: GAO is the biggest and best supporter of Congress in helping it meet its responsibilities.
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: Human-rights groups argue that the current tribunals, having no police force to back them up, are too weak to be effective.

Sentence 2: Tribunals are quite effective without the involvement of police.
Is this second sentence entailed by the first?

Answer:
no