Well first

I doubt you will find even one post on any site that would have told you to send any blood test in to Texas A&M for disease. The run the old outdated AGID tests, and those of us who have been around awhile and started with this test know how unreliable it really is. It's a great tool for testing Johnnes, but that really is about it.
You want a CAE test for Elissa, like WSU uses, go to saanendoah.com and print out the information on it for how to send it in and how much, if you send in extra blood they will also run CL for you, they used to send it to UC Davis for the results, now they do it in house. UC Davis is THE place to CL testing, but yes, if your goats where vaccinated for CL they will forever test positive, why I wouldn't ever vaccinate for it. All CL vaccines are for sheep, there is no CL or rabies vaccines for goats, why some goats seem to have such a bad reaction to them, and why likely you have the titer raised so you will never know if the goats actually have the disease or the test is just catching the antiody. Probably and excellent question for Ross over on the sheep forum...do sheep test positive for CL once vaccinated? Do the testings on sheep tell you the difference between true disease or titer raised by vaccine?
Other than for purchases, I would not base my whole herds health or keeping someone based on only one test.
I will say that even with an old AGID test from Texas A&M I would be worrisome about a positive result, the AGID tests where notorius for giving us false negatives, even in does with clinical signs.
IF you want to use a Texas lab than Pan American Vet labs also does Elissa. I use them yearly, I do use WSU for sales when asked. I use Pan Am sort of a base test, I do yearly colostrum, do a few infant kids a year, do crazy things like blood from umbilical cords, which I will do this year also, doing it also in a kid that is being born to a positive for CAE mom in another herd....have sent in knee fluid from a known positive doe. I have always wanted to do amniotic fluid from a known positive doe, just never have had the chance. Vicki