It's covered in the article. The school district has a contract with Thompson Reuters Clear. And here's more general information on that service:

https://legal.thomsonreuters.com/blog/leveraging-license-pla...

Key bit:

"With LPR intelligence tools such as Thomson Reuters license plate recognition, corporate crime professionals have the ability to share and request the sharing of commercial LPR data with other corporations."

Eg. Flock and Vigilant Solutions.

https://losgatan.com/class-action-suit-against-flock-license...

https://www.businesswire.com/news/home/20260227692233/en/Flo...