What is the purpose of the anecdote with which David Foster Wallace opens the speech? What is the effect of his returning to the line "This is water" again near the end of the speech and repeating it there?

this answer was editing it cause i couldn't delete!

answer: the tobacco industry has traditionally been one of the most important industries in north carolina and a backbone of the state's agricultural heritage. yet as the north carolina economy continues to transition from an agricultural economy to a manufacturing and, increasingly, service-based economy, the industry faces new challenges, both at home and abroad

explanation:

both inform the reader that faryad and liaqat were not given the chance to tell their version of events at the police station.

hope this