re: So I put a roast in the crock pot over night and

Did you cook it last night?

When i do weekday roasts in the crockpot, i put it on low when i leave. But i also have juice in there. I use a mixture of condensed cream of mushroom, dry onion soup mix, and beef broth. Sometimes i just use wine and water.

Always comes out great. I would think if you just had it on warm, it won't cook all the way through