The forensic field moves very slowly in adopting new technology since they have to do a lot of re-validation every time anything changes.
This idea already here, but with technology based on older/simpler methods. One example is Intigenx: https://integenx.com/rapidhit-system/
The FBI has plans for implementing them: https://www.fbi.gov/news/testimony/fbis-plans-for-the-use-of.... The laws just need to catch up (or prevent it).