France recently passed a bill allowing law enforcement to remotely access camera/mic on user devices - what are the technical/business/logistical merits of implementing a backdoor for this purpose?

Not here to discuss the implications of this- more curious on how easy or realistic this is and what is involved- manufacturer would need to comply after legal procedures and then implement something via an update? If a phone is purchased outside of country what difference would this make as it will likely just be software based?

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