Without Evidence (1995) on Netflix

Plot summary

Drawn from a real case in Oregon, the story follows Michael Francke, who runs the state's prison system. He visits his brother Kevin and tells him he has been stepping on toes inside the department, that he found things there and intends to clean house. A drug ring among his prison colleagues is part of what he describes. Michael is then killed. Kevin takes up the case himself, and his inquiry carries him into more lies and deceit.