I’m thinking unless you get one at birth, you can never trust a pit. I hate to sound like a bastard, but I would euthanize every pitbull that goes to a pound. Too much risk.
That would be about 95% of the dogs at our local pound. Seriesly. We used to visit the pound with the kids...adopt the occasional dog.
Not worth the trip anymore...nothing of value there now. (Plus, the kids have grown up.)