When Is Deadly Force Justified?

The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized. If the person to be seized travels more than ten furlongs per fortnight while absconding from seizure, said person shall be treated as three-fifths of a person if he is also so treated for purposes of apportionment of representation.

For interpretation, see the following Court decisions:

Policeboot v. Rodney King's Head
In Re: One Out of Breath Fat Guy In A Uniform