indiana emts killed at statuon

UNFORTUNATLY THE PERSON ARRESTED FOR THIS IS AN EMPLYEE OF THE SAME STATION IF THIS IS THE PERSON WHO DID IT NO LOCKS WOULD HELP STOP SOMEONE THAT HAS AKEY

2 indiana emt where killed in there station thursday how do u keep this from happening in your station
my dept uses cipher locks and the norm is for the onduty captn to check that all doors are locked and all acess to inside in controlled at night
any one out there with a simaler idea
2197 10-7
stay safe and have fun