You have a friend whose matches are worse than yours, and every time you party up the game warns you about it. The question people actually ask is not about that match. It is whether playing with them, week after week, drags your own account down with theirs. Valve has answered half of it. We measured something adjacent to the other half.
What Valve Confirms: The Party Uses the Lowest Score
The Trust Factor FAQ is direct: “when players are in a party, we use the lowest Trust Factor of any individual in the party for matchmaking purposes.” Your five-stack is matched as if all five of you had your friend's score. That is why the warning exists, and the FAQ frames the decision as yours: “You may still queue with this user, but with the understanding that the quality of your match may degrade since their Trust Factor is significantly lower.”
So the match you are about to play is affected. That much is written down. Whether the account you play it on is affected afterwards is a different question, and the FAQ does not answer it.
Your Score and Your Match Are Two Different Things
Keep the two apart, because the forums do not. “Lowest in the party” is a rule about how one lobby is built. It says nothing about your number changing. The 2017 announcement described Trust Factor as built from “observed behaviors and attributes of their Steam account”, your account, your behaviour. Reports, playtime, history in other games. Nothing Valve published makes your friend's number an input into yours.
That is not proof it is not. The FAQ says Valve is “not providing the list of factors”, and a system that reads Steam-wide behaviour could, in principle, read your party history. We simply have no statement that it does, and neither does anyone who tells you it does.
Where “It Drags You Down” Comes From
The belief has a plausible origin. People who party with a low-trust friend get worse matches, by design, and worse matches produce more reports, more rage-quits and more team damage on everyone in the lobby. If your own behaviour slips in those matches, the reports against you are real, and reports were on Valve's list in 2017. So a player can come out of a bad month of duo queue with a genuinely worse record, and attribute it to the friend rather than to what happened in the games. The mechanism is behaviour, not contagion. It still ends in the same place.
What We Measured About Company, and What It Is Not
Here is the part we can add, with its label attached: this is about bans, not about Trust Factor. A VAC or game ban is public, so we can collect millions of profiles and ask a concrete question: do the friends of banned accounts get banned more often than the friends of clean accounts? We ran that in August 2026 with a control group from the same Steam group, to rule out the boring explanation that CS2 players simply know other CS2 players.
Show the numbers
| Where the account came from | Accounts | With a ban |
|---|---|---|
| Friend list of a banned account | 1,837 | 18.94% |
| Friend list of a clean account, same Steam group | 1,086 | 9.02% |
| Random SteamID64 | 633 | 9.64% |
The idea for that measurement came from the owner of this company, not from a paper: cheaters have friends who cheat, and they have their own alternate accounts, and both show up on a friend list. The number confirmed it. What the number does not say is that your friend's ban rate is your fate. It is a correlation among accounts that already had bans when we read them, on a sample we built by following friend lists, and it describes how banned accounts look, not who will be banned next. Valve may or may not read the same graph. We cannot see that.
What it does establish is that who you keep on your friend list is a public signal that travels with bans in the wild. If you are choosing what your profile shows the world, that list is part of it.
What Valve Tells You to Do
Two options, both on the FAQ. First, if you suspect it is your friend: “we recommend you have your friend (who you believe to have the lowest Trust Factor) email us at the address previously provided with their Steam ID and information.” Second, the thing it says to everyone: keep “playing Counter-Strike 2 and other Steam games legitimately”. Your friend's score, whatever it is, is theirs to move; the FAQ notes that as it improves, “this message will show to fewer users”. We wrote up what the warning does and does not mean in the post about the yellow warning.
What Your Own Friend List Says About Your Profile
You cannot read your Trust Factor, and you cannot read your friend's. You can read what both of your public profiles show, and the friend list is on that page. Our Steam Profile Checker reads it as one of 74 public signals, as a share rather than a count, because a hundred friends with two banned among them is a different profile from ten friends with two banned. It is not a Trust Factor reading, and the page says so. It is the visible part, scored against the study above, so that the next time the yellow line appears you know what your own profile looks like from the outside.
Background on the whole system, including the parts Valve has confirmed and the parts nobody has, is in Steam Trust Factor explained.
