It depends on the school - some have automatic cutoffs, some don't. When I was at UCSD, someone called the office to ask about this, and I remember the admissions secretary answering quite politely what the minimum MCAT was - I *think* it was a 7 in each section, but I'm not sure at all, so get it from a better source than me. I don't think you should be afraid to call schools that you're interested in individually and find out so you don't waste your time and money if you're going to be automatically rejected.