Final answer:
Deadly force is justified when there is an immediate threat of serious bodily harm or death to oneself or others.
Step-by-step explanation:
Deadly force is an extreme measure that should only be used in specific circumstances. In general, the use of deadly force is justified when there is an immediate threat of serious bodily harm or death to oneself or others. This can include situations where a person is being attacked with a weapon or exhibits clear intent and capability to cause harm. However, the specific standards and laws around the use of deadly force can vary depending on the jurisdiction and the circumstances of each case.