
Sara Harper says nothing really prepares you for the moment you put on that 911 headset.
"There's a little spike of adrenaline because you're like, 'oh, god, here we go,'" says Harper, who started at Denver 911 in 2013. "'What is this going to be? Is it just going to be an easy one? Is this going to be an annoying one? Is this going to be the call that changes my life?'"