Actinemys marmorata
They been good, they did the right thing, they only took picture of this guy, did not touch him, did not taking him home.Oh you guys...that's not a tortoise. It's a water turtle. I don't think it's an A. marmorata, though. It looks like a slider to me. If you can ask your friend to wet the tortoise and clean it off so we can better see the 'design' on the carapace, we can give you a better answer.