Collars
2205
The design for the Collar is perfected. It is a simple bomb attached to the wearer's neck, fitted at birth and activated by a radio signal. The new design is flawless: it grows with the wearer, is impossible to remove, and it is impossible to block the activation signal. Any violent or property crime is now punishable by detonation, as is any form of disruptive protest.
At first people are reluctant to adopt it, and a fraction try to oppose it, but the vast majority understand that the Collar is the only pathway to a truly peaceful society.
2229
Now that the system has had time to settle in, the economy has stopped suffering, and the sentencing rate is finally dropping. Very few have the drive to protest anymore; public opinion has swung in favour of the Collar - after all, why would anyone oppose wearing one unless they intended to break the law?
Any and all issues, personal or systemic, are addressed peacefully through balanced and fair laws and voting. Society has outgrown the need for vigilante justice, strikes, or riots.
2283
Crime rates are at the lowest recorded in history. There was a brief moment of chaos in the adoption phase as people adjusted to the harsher sentencing, but with each passing generation the population has drawn closer to harmony. The first generation struggled to adapt, although their children were more accepting, and in turn their children's children couldn't imagine a society without the Collar.
It has been over a year since the last recorded theft, even longer since the last murder. Now that the system has had time to establish itself the population finds itself at record productivity as well; if you didn't take work seriously you'd lose your job, which would mean losing your income, and those fail to pay their rent become subject to sentencing. Workers are highly incentivised to do their best, and there are vanishingly few reports of workplace abuse from higher-ups.
2301
It has been nearly a century and the economy still has yet to fully recover, even with record employment and productivity levels. Experts are baffled by the suicide rate.