Nanotech

Nanotech has mostly medical applications, cellular level repair and such. It’s also used for installation of nervous hardware like links. No self replicating nanotech exists and it’s prohibited by law. Some underground doctors have dabbled in it but as the means to create viable nanotech is easy to track and hard to forge, it’s very uncommon those police departments get a call. 
The machinery used to manufacture circuitry could also be considered nanotech, but again it’s simply very small machinery, not tiny self contained robots as are commonly meant.
Genetically engineered organic nanoforms are more common. After the post-antibiotic age most medical outlets began using electronic antibiotics. 
The implant mechanics of Transcription bubbles can be considered a form of nanotech. Category:Technology