https://techcrunch.com/2019/04/12/juul-launches-a-pilot-program-that-tracks-how-juul-devices-get-in-the-hands-of-minors/

Juul Labs is today launching a pilot for its new Track & Trace program, which is meant to use data to identify exactly how Juul devices wind up in the hands of minors.

Juul vaporizers all have a serial number down at the bottom, by the Juul logo. However, it wasn’t until recently that Juul had the capability to track those serial numbers through every step of the process, from manufacture to distribution to retail to sale.