Derik Zimmel owns True North Polygraph and administers the tests for some of the country’s largest fishing events, including the National Walleye Tour and Masters Walleye Circuit Derik Zimmel of Grand ...
Nov. 11—GRAND FORKS — When Derik Zimmel started his polygraph business in 2009, he didn't anticipate that fishing tournaments would become an important part of his workload. They have. "I had hoped ...
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