Season 3 devotes a lot of time expanding the relationship between Leo Norbert Butz’s untrustworthy Kevin and Beau Bridges’ mysterious and equally untrustworthy Roy Gilbert.
Unfortunately (but not surprisingly), the one that Kevin trusted the most was actually a DEA agent.
His blind eye to Roy’s trafficking turned into full-on participation, thanks to a group of Cuban drug runners.
Understandable, since their story likely would have gotten stretched out across potential future seasons.