I don't think it's a blueberry, they're not hard when they have color. I still think it's a wild raisin, don't understand the oozing though. I'd like to check out some here and see if there is any oozing, but where I know for sure there is some is up behind my parents house, and I haven't been over there in a couple yrs.
If it ain't a wild raisin, I'd say probably poisonous. ...
If it ain't a wild raisin, I'd say probably poisonous. ...