Can RF technology provide security?

I have to say that after hearing about the tragic events that took place at Virginia Tech I began thinking about how the future of technology will provide an array of opportunities to protect our safety. Currently, Bowie State University utilizes a web based service called e2Campus that sends SMS text messages to cell phones to notify of emergency situations on campus http://news.thomasnet.com/companystory/492954. This certainly would have had more immediate results than the emails that were sent by administrators at Virginia Tech and would probably save them from the many lawsuits they may face.

One thing that came to my mind as a means of providing safety was RF (radio frequency) services and devices that are currently utilized in ways to create speed and efficiency within supply chains for companies as well as in other profit oriented endeavors such as advertising and target marketing. What if organizations utilized radio frequency to warn constituents about dangerous situations and provided updates on the progress of events? Imagine going to your local bank to conduct a personal transaction and your cell phone receives a message that the bank has just been held up. Local and national governments could utilize RF technology to warn of terrorist attacks, sexual offender releases, Amber alerts, evacuation notices (e.g. toxic spills), virus outbreaks (e.g. AVI, SARS), etc. In order for RF to benefit society in these ways it first needs to become a safe and non-hazardous technology in and of itself before it could be utilized to save our lives.