After the basics, you should be able to get some kills in traitor rounds. Now it's the part about catching traitorz!!! Some people just shoot those people who follow them or those who killed someone . That's real bad as you lose karma and the other guy lose the chance to kill traitors, as he died. With low karma, you just simply fail as others' damage is higher then you. 1:When you witness some small gunfight, try to shout the names of those who are fighting. One of them may be traitor.
2:When someone is walking near a unidentified body, say the guy's name and try to ID the body. If the body is an innocent, the guy walking is most likely a traitor(except for him trolling). The less risky way to solve this is to keep an eye on him, instead of killing him.
3:Sometimes people will hold an Unidentified body around in public. Don't shoot them! Most of them are trolling, trying to make you kill him and lose karma. Of course if he's really obvious to be hiding the body, kill him.
4:More about trolling, people will hold knife in public and make people kill him. Calm down, and see if he's attacking first.
5:Some people will kill players with low karma, as they lose only a little bit. If you see it happening, dont kill him until he attack more of others.
6:Suspect those who dont get into the traitor tester, but dont shoot until he do something traitorous.
7:Watch people's speech. If he get shot "randomly" and shouted "RDMer", he's might be traitor(innocents who aren't being target rdmed, continuously rdmed should shout traitor)
8:Beware of C4s. If you are not sure of which fuse to be cut, run from it and ask the detective to defuse it with defuser when possible- failing to defuse it will help the traitor a lot.
9:I've been seeing detectives who dont scan bodies. To scan a body for DNA, left click to the body, then right click, find the item you wanna scan, then press "scan".