Assassin drones.
The tiniest of drones are capable of carrying a 3 gram shape charge explosive that will easily kill someone.
The article linked below is over exaggerating how small it is, but a 3 inch by 3 inch (75mm) square drone will have the capacity and range to carry the explosive (much less than weight of bullet) a few hundred feet, use face recognition to find, and then detonate to kill him/her.
The tech is already available, it not if but when.
Best we are aware of the horrible exploits of positive tech than be ignorant of it.
getpocket.com
The tiniest of drones are capable of carrying a 3 gram shape charge explosive that will easily kill someone.
The article linked below is over exaggerating how small it is, but a 3 inch by 3 inch (75mm) square drone will have the capacity and range to carry the explosive (much less than weight of bullet) a few hundred feet, use face recognition to find, and then detonate to kill him/her.
The tech is already available, it not if but when.
Best we are aware of the horrible exploits of positive tech than be ignorant of it.

Omniviolence Is Coming and the World Isn’t Ready
Emerging bio-, nano-, and cyber-technologies are enabling criminals to target anyone anywhere and, due to democratization, increasingly at scale.