According to Stanford's Bioengineering website, it says
Applications will not be accepted after the December 6, 2016 deadline. All supporting documents must be received by the application deadline at 11:59 pm. Our faculty will begin reviewing files immediately—applications without supporting materials will be considered incomplete. In order for your application to be competitive, ensure that all of your supporting materials will arrive no later than the application deadline.
does that mean they won't review if the LOR and GRE scores do not arrive by the deadline?