How Safe Are Gun Free Zones?

Killers like them:

The other statistic that emerged from a study of active killers is that they almost exclusively seek out "gun free" zones for their attacks.

In most states, concealed handguns are prohibited at schools and on college campuses even for those with permits.

Many malls and workplaces also place signs at their entrances prohibiting firearms on the premises.

Now tacticians believe the signs themselves may be an invitation to the active killers.

Other interesting points are made in the study regarding response to a hostage situation such as Columbine.