More to the people producing it than using it. But metallurgy and mining must have been awfully dangerous industries to be in back then regardless of the arsenic.
Seems that lethal dose for arsenic is likely too high to be transmitted by even a pure arsenic trioxide blade, unless it was manufactured with the intent of leaving bits inside the wound, like maybe a blade a rough brittle surface to leave grit. Even so, would have to introduce ~50+mgs worth, which sees like a tall order.
Seems arsenic bronze is even less toxic, so probably not poisoning anyone. I wonder if the minor local toxicity of arsenic blade cuts would reduce the chance of the wound causing sepsis.
