In some of the videos of police killing suspects, the visuals can leave at least a little room for questions about context, perceptions of threat, and reasonable uses of force.
"It was a reasonable use of deadly physical force".
"If I were a general in charge of a combat force, and I needed people to stay awake for their own safety," Dr. Nestler said, "I think that's a reasonable use of the drug".
The latest version of the border protection agency's use-of-force manual, from 2010, says, "Only that force which is both reasonable and necessary may be used in any given situation".
Use-of-force experts who reviewed the video said Friday that Rojo's resistance made the use of physical force necessary and reasonable.
After his speech, the International Association of Chiefs of Police published a blog post that detailed its use-of-force policies and training, highlighting the need for officers to "ensure that any use of force is carefully applied and objectively reasonable".
Rice's family released a letter on Friday that cited their own use-of-force experts as saying they "strenuously disagreed with the conclusions of [the] so-called experts who concluded the shooting of Tamir Rice was reasonable and justified".
Hugh Southey QC, who argued the case at the ECHR, challenged the adequacy of the UK's definition of self-defence since the officers who shot De Menezes only had to show that they had an honest belief – as opposed to an honest and reasonable belief – that the use of force was absolutely necessary.
[t]he "reasonableness" of a particular use of force must be judged from the perspective of a reasonable officer on the scene, rather than with the 20/20 vision of hindsight.
