Crimes of Style
by johannespunkt
Every criminal shall be fitted with a new conscience, as their old one must be malfunctioning. This will make them feel properly awful if they attempt to commit an immoral or unlawful act; this feeling will spill over to certain acts of buying or appreciating “bad” brands. If, despite these measures, a criminal is caught committing more crimes, they will be fitted with a new moral and aesthetic compass, which will let them better discern what is “right” and also what is “cool.” If trends change, the implant will gradually change the brain.
You may also volunteer for this treatment.
Johannes Punkt’s Flaskpost 
in babylon 5, criminals are sometimes washed out, their personality removed and only implanted with a sense of wanting to serve the community. This was put in place when earth took away the death sentence. I have been thinking a lot about that episode lately.
In Locke Lamora’s Lies, there is a magic thing that can ‘gentle’ animals — basically zombify them. They can only eat and walk, and barely that, if I recall correctly.
In a city which hangs children for pickpocketing, gentling actual humans was deemed too cruel and unusual a punishment, and was outlawed.