The ECG readout at the end showed Kelly's pulse as 59-60 bpm, however, the beeping was faster, closer to 75 bpm.
When Hood gives Kelly CPR, she is connected to a Heart Monitor. If he had been giving CPR correctly, the monitor would have registered each compression as a heart rate spike, showing his rate through the monitor.
Most people - especially law enforcement agents - would recognize the symbol for biohazard. A sheriff/police officer would never pick up a biohazard container, let alone open one up without first contacting the Centers for Disease Control and Prevention or some other similar agency.