Experts say more people could have been shot at Chicago's Mercy Hospital if not for the preparedness of hospital staff, according to an article on The Chicago Sun Times website.
The staff only recently had reviewed how to respond to an active shooter.
Training for active shooter situations has become part of the regular schedule of annual workshops caregivers must undergo.
In the Nov. 19th incident, three people — Dr. Tamara O’Neal, pharmacy resident Dayna Less and Chicago Police Officer Samuel Jimenez — were killed by O’Neal’s ex-fiancé, Juan Lopez. Lopez died in a shootout with police.