because it appears there were those security lapses you were talking about. >> but the sheriff reiterated that pierson apparently planned this for a long time. for instance, he had been acquiring ammunition until the very day that all of this was going on, that he tried to hide this from the public, but the main thing was, yes, there appeared to be a security lapse. he did manage to get in through a door that should have been locked. let's listen in to what the sheriff had to say. >> we know that the doorway on the north side, that the murderer entered, is supposed to be locked. unfortunately, it rarely is because it is more convenient for people to come and go from that area and not have to be obstructed by a locked door. >> so it was people who were basically looking for an easier way to get in and out of the building every day, and therefore, that door that should have been locked was not locked on that day. one of the other things the sheriff said was that pierson managed to get in unobstructed