Listed as a German-American '00 with their U16s: http://fck.de/de/1-fc-kaiserslautern/nachwuchs/leistungsbereich/u16/spieler.html
According to Fupa, he's with SG Meisenheim/Desloch-Jeckenbach (quite a mouthful), which is also where Tyler Jankowski is at. Apparently they were together at Kaiserslautern too. http://www.fupa.net/spieler/justin-smith-502506.html
According to Fupa, his new club fields a U17 team in the same league that Kaiserslautern U17 participated in last year - the U17 Regionalliga SW. I think Kaiserslautern were promoted back to the U17 Bundesliga, while M/D-J were lower-mid-table.
Looks like he's now at SV Morlautern. https://www.fupa.net/spieler/justin-smith-502506.html Its roster is a bit of a "Hey, that guy!" catchbasin for overusers of this forum. Also, it features two young men of presumably Italian descent about whom, one might say, everything is good.
He's currently a Wormatia Worms: https://www.wormatia.de/archiv/spieler-datenbank/spieler-steckbrief/?spielerid=1415