Five Ounces of Pain has more:

While attempting to confirm whether a TMZ.com report suggesting that Quinton “Rampage” Jackson was declared medically unfit for booking while being processed through the Orange County jail, a representative with the Costa Mesa Police Department indicated to FiveOuncesOfPain.com on Wednesday morning that Jackson made bail and was released from police custody late Tuesday.

Sam Caplan says he called major hospitals in the area and could not confirm Jackson was at any of them. I'm going to contact the UFC to see if they have any statement at this time.