Some common reasons include: 1  a serious accident â such as a road accident, a severe head injury, a serious fall or severe burns. 2  a serious short-term condition â such as a heart attack or a stroke. 3  a serious infection â such as sepsis (blood poisoning) or severe pneumonia.
The definition of unnecessary is not needed. An example of something unnecessary is a bowl of sugar for cooking meatballs.
Necessity excuses or extenuates an offense in capital cases, but not in civil cases. Necessitas est lex temmoris et loci. Necessity is the law of a particular time and place. Lex judicat de rebus necessario faciendis quasi re ipsa factis. The law judges of things which must necessarrly be done as if they were actually done.