Virginia Tech's firearms policy [PDF], released in July 2005, violates Virginia gun laws. Virginia's pre-emption law says that localities and state agencies cannot enact restrictions that are more severe than state law. That doesn't stop them from trying, though:

2.2 Prohibition of Weapons The university's employees, students, and volunteers, or any visitor or other third party attending a sporting, entertainment, or educational event, or visiting an academic or administrative office building or residence hall, are further prohibited from carrying, maintaining, or storing a firearm or weapon on any university facility, even if the owner has a valid permit, when it is not required by the individual's job, or in accordance with the relevant University Student Life Policies. Any individual who is reported or discovered to possess a firearm or weapon on university property will be asked to remove it immediately. Failure to comply may result in a student judicial referral and/or arrest, an employee disciplinary action and/or arrest, or arrest for trespass and/or violation of the appropriate state criminal statute.

As a "visitor or other third party" who routinely attends sporting events at Virginia Tech, I fully intend to traverse Virginia Tech campus and state property as I see fit - and as provided by the laws of the Commonwealth. Tech may get away with taking disciplinary action against students who dare to afford for their own defense, but they have no legal recourse against private citizens.