A fast pass is a ticket you may request when you check out of most hotels in Baja California. It allows you to take the medical lane when you cross back to the USA. It is very fast most times. By that I mean that the waiting period is considerably shorter than if you drive across the regular multilane. Corona hotel is the only one that I know includes the fast pass. Other hotels you need to ask for it and they might charge you extra. I think is well worth it tho.
Get an answer from Corona Hotel & Spa staff and past guests.