"60 MINUTES" LISTINGS FOR SUNDAY, APRIL 21, 2013

SNIFFING OUT BOMBS - The dogs trained to accompany soldiers into battle protect them in many ways, including sniffing out bombs. Such working dogs often go from the battlefield to police departments, where they are utilized for security work at events like the Boston Marathon. Lara Logan reports. Max McClellan is the producer.

ANGEL OF DEATH - Serial killer nurse Charles Cullen confessed to as many as 40 murders, but some believe he killed many, many more patients over a 16-year career. The serial killer speaks to Steve Kroft in his first television interview. Graham Messick is the producer. THIS IS A TWO-SEGMENT REPORT.