It is said The road to hell is paved with good intentions...

An implanted chip could be very useful as it can be a debit card that can not be stolen and credited for work performed so there would be no need for cash any longer which would stop much crime.

It also has transponder codes which can be picked up by any cell tower, so say Amazing Grace murders someone they could tell in an instant who was with the victim at the time of the crime. Further they can tell where you are so that they can pick you up.

Last I heard a decade ago they were also working on stimulating certain nerve endings to release certain chemicals to help control emotions(mind control). This was back then think of the advancements today...