TIL US Global Traveler card

TIL that if you are registered on the US Global Traveler program, then upon reentry to the US you don't need to have your Global Traveler card on you. You can just scan your passport. I wonder if it was always like this. Anyway, it's super convenient because while I brought my passport abroad, I didn't pack my traveler card. 

Global Traveler is great, and it saved me a line of like 100-200 people going through CBP today!