I've had yellow bellied racers in the past and one piceus.
One racer was a rehab that went to a local wildlife museum - a full grown adult that bucked the aggro trend they tend to carry. Very docile. May have had something to do with all the medical attention and handling he went through when he was rescued.
For years I wanted a piceus and got my chance. I have never been bitten more times by an animal..........wild.
BTW: There are forums set up just to discuss them............