No, Don Jenkins was never registered through the Arizona Board of Technical Registration so he wouldn't show up. He was registered through the American Institute of Professional Geologists (AIPG) as a Certified Professional Geologist (CPG), until last year sometime when he resigned. The State of Arizona does not recognize the CPG certification and it is not a substitution for being an RG with the AZBOTR.
I am not saying that being a CPG has no worth, because the AIPG is a legitimate organization. However, I understand that the AIPG is taking a closer look at the whole CPG program because there have been a rash of complaints lately regarding geological reports signed by CPGs. Unlike the RG, the CPG does not require a test, just a degree, experience, an application form, and recommendations from at least two other CPGs.
I have heard that Mr. Jenkins was approached by the AIPG about several recent complaints against him, and that he chose to resign rather than face being revoked. I do not have proof of this, so take it for what it's worth. I heard it from someone who is in a position to know - I tend to believe it because why would someone give away a certification like that?
By the way, I have also seen several reports that Mr. Jenkins has signed as a Mechanical Engineer. He is not registered in Arizona as an engineer, and this is a violation of the AZBOTR rules.