My group encountered some chaos marines. After dealing with them, one of the players commented that taking the heavy bolter from the fallen chaos marines would boost their onw ability to deal with what else was on the planet.
The other players all refused saying the equipment would be tainted. I agreed that would be the general outlook of a marine, so they wouldn't use the weapons or ammo left lying about.
Having read some of the novels, this appears to be the case in the setting.
However, would the stuff actually be tainted in any way, or would this merely be one of those things assumed by people in the setting?
And whether it's actually tainted or not, would there be ways to cleanse it? Though I'm thinking a techmarine or techpriest would be needed for that...