1. However, threatening to do a lawful act will usually not be illegitimate. 2. Trespass may sometimes lie for the consequences of a lawful act . 3. Prime Minister David Cameron insisted that it was a lawful act of self-defense. 4. An obvious case involving " lawful act duress " is blackmail. 5. It is a lawful act of national self-defense. 6. This charge could cover a " lawful act done without due caution, which might produce death ." 7. And second, I say Chiusolo was committing a lawful act as a police officer in the course of making an arrest. 8. Thus a short drive across a state line would become a crime _ abetting a minor in the commission of a lawful act ! 9. The blackmailer has to justify, not doing the lawful act they threaten, but against a person highly vulnerable to them, the demand of money. 10. However, contrasting to cases involving business parties, the threat to do a lawful act will probably be duress if used against a vulnerable person.