I have been studying the use of deadly force in NY. According to the law cited below, its a little confusing. http://ypdcrime.com/penal.law/article35.htm We can clearly use force to defend ourselves or another from illegal violence , unless escape is possible. We are not required to attempt to escape if we are at home. We can use force to detain someone that we witnessed commit a crime or we know for sure has committed a crime, so as to hold them for the police to come and formally arrest them. Deadly force is more...iffy. We cannot use deadly force to simply protect property, unless the suspect is carrying a weapon that we believe will be used against us to commit deadly harm. But....it appears we can use deadly force to prevent a robbery at our home or place of business? This is where I dont fully understand.