This.
For 99% of the people (SWAG) the pain from these will make them comply, the rest will continue to fight and bones will be broken, ligament damage will occur and lawsuits will follow.
bob
One of the problems is the leverage is so great, the officer may not have any "feel" for how much he is hurting the arrested. When the force applied is so little, compared to the force received. it can be very hard to modulate. This is not going to work out well.
Unless they have managed to close Bruce Lee.