"a deadly force" is a valid phrase and can be used in written English.
You could use it to describe something with the potential to cause great harm or destruction, such as an army or a powerful storm. For example, "The approaching storm was a deadly force that caused massive destruction in its path."
We're not using deadly force when a deadly force molotov cocktail was used on us".
Having reclaimed their homeland from the Dragon Smaug, the Company has unwittingly unleashed a deadly force into the world.
Among them: the battered Taliban remain a deadly force; the militias the Americans increasingly rely upon are often as shady as the insurgents they fight; American technology still cannot defend against some maddeningly simple weapons, mines and roadside bombs.
The accompanying message as he met Arsenal's Chilean whiz for the first time oozed a combination of excitement and bravado: "Watch out Premier League me and Alexis will be a deadly force!
In practice, Tasers are not used as a deadly force alternative but as a compliance tool against nonviolent persons, without the strict limitations, supervision and accountability we require for deadly force.
Its big idea – that shooting is only justified if a driver poses a "deadly force by means other than the vehicle" – essentially swept away the justification of car-as-weapon in most cases.
"Officers are trained to view every encounter as a potential deadly force incident: you walk up to a person who is loitering outside of a convenience store, their hands are in their pockets.
A US police expert, Lieutenant Todd Faulkner, said earlier this year that the Taser should never be deployed during "a dynamic, deadly force situation".
One is a murderer employing deadly force with a deluded sense of self-defense... and the other is George Zimmerman".
A "use of deadly force" review board and an external review committee found that officer David Kelley violated police policy when he opened fire.
He was questioned but released without charge under Florida's controversial stand-your-ground law, which states a killing is justified if a person uses deadly force fearing his own life or safety to be in jeopardy.
