John S. wrote:

> The technology is already available and in use. Cell signals can and
> are electronically blocked - you can buy the device on the net. Why do
> you think cell signals disappear the moment you walk in the hospital
> front door.
>
> Actually I think it is unfortunately necessary since some people are
> rude enough to not turn their cell phones and blackberries off during a
> movie.

Cell phone signals can also interfere with machinery that the hospital
uses to monitor as well as administer medication and/or ventilation to
patients.