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It depends on your State:
For example, Texas:
Acts 1973, 63rd Leg., p. 883, ch. 399, Sec. 1, eff. Jan. 1, 1974. Amended by Acts 1993, 73rd Leg., ch. 900, Sec. 1.01, eff. Sept. 1, 1994.
Florida:
The 2014 Florida Statute- Title XLVI-CHAPTER 776 -JUSTIFIABLE USE OF FORCE
That being...