Fantasy Football Commissioner Collusion Investigation: How to Investigate and Handle Suspected Collusion
The first rule of collusion investigations: do not announce you are investigating until you have enough evidence to act. Premature announcements create defensive behavior from the managers involved, alert others who might be participating, and generate unnecessary league drama if the trade turns out to be innocent.
Collusion Investigation Quick Reference
| Investigation step | Action | Evidence standard | Mistake to avoid |
|---|---|---|---|
| Initial review: fair market value test | Look up ADP for every player in the trade; 20%+ total value imbalance warrants closer examination | ADP data from the draft platform or public database | Vetting every trade that looks imbalanced — only investigate when the imbalance is large and combined with other signals |
| Pattern check: same managers, multiple trades | A single lopsided trade might be poor judgment; 2–3 lopsided trades between the same managers across the season is the collusion pattern | Transaction log from the beginning of the season | Declaring collusion on the first lopsided trade — a single bad trade is not a pattern |
| Relationship check | Real-life relationships between managers are relevant context, not proof — close friends make bad trades legitimately | Verify through direct knowledge or league history | Treating a real-life friendship as proof of collusion — relationship context informs the investigation; it does not conclude it |
| Announce only when ready to act | Do not announce an investigation until you have enough evidence to issue a ruling | Clear pattern of trades + relationship context + no plausible competitive motive | Announcing an investigation without enough evidence to act — premature announcements create drama and tip off the involved parties |
| True collusion confirmed: reverse and warn | Roll back the trade; issue a written warning to both managers; document in the league record | Clear written communication; post in league chat | Verbal-only warnings — documentation protects the commissioner from future “you never said that” claims |
| Repeated collusion: remove the manager | A manager who colludes repeatedly or with clear malicious intent should be removed from the league | Prior documented warning + additional confirmed evidence | Issuing a third warning instead of removing — repeated collusion with no escalating consequence signals the behavior is tolerated |
How to Evaluate a Suspected Collusion Trade
Fair market value test. Look up ADP for every player in the trade. If one side is receiving dramatically more total ADP value than the other (20%+ imbalance), it warrants closer examination. A balanced trade where both sides receive comparable value is almost certainly not collusion.
Pattern of trades between same managers. A single lopsided trade might be a bad decision by one manager. Multiple lopsided trades between the same two managers across a season or multiple seasons is a red flag that warrants investigation.
Relationship between the managers. Real-life relationships (friends, family, co-workers) between managers who make lopsided trades should be noted. Relationships alone do not prove collusion — close friends make bad fantasy trades all the time — but they are relevant context.
What Constitutes Collusion vs Bad Judgment
True collusion. One manager gives away elite players for essentially nothing, or a manager mysteriously benches their best players against a specific opponent. These require intent and coordination.
Bad judgment. A manager who overvalues a player they like, makes a panic sell after a bad week, or trades their future for present returns is making a mistake — not colluding. Commissioners should not void trades based on one party making a poor decision.
For how collusion connects to trade review procedures, see: Commissioner Trade Policy: How Commissioners Should Handle Trade Reviews and Veto Systems.