1. Criminal (inmate) control by giving the "user" of the chip a shock
2.If injured, when in hospital doctors can get data about the person off of it.
3. Technology breakthroughs
1. Hacking the chip and accessing valuable information
2. Unwanted traveling through the body
3. Forced to have one
I believe that there are a solid amount of good things and bad things about these microchips. But even with that said, I believe they will be like cell phones. At first not a lot of people will want them or have them, but over time, everyone will have one and it would be crazy if you didn't have one. I think these chips are the next big breakthrough in this technological era and they will be a thing no matter what.