Assuming US scenario—state crime labs have digital forensic units, which generally train up moderately technically familiar folks into forensic examiners. As previously noted, pay is generally far undervalued—the pro is that they do the training portion. Counties and large municipalities have also started to establish their own labs to reduce backlog.

In general, look on governmentjobs, and expect 6mo+ for background check (and often polygraph), and then a year of training.