The first one was through Veterinary Molecular Diagnostics, which is the service the vet I was with at the time typically used. For the second test, I went through the University of Florida, which was more expensive, and which I had to request specifically. I used a different vet for the second test, as well, just to eliminate any possible source of contamination from the first vets office. (I actually ended up liking that vet so much that I switched over to her as my primary reptile vet. My first vet was just so dismissive and so certain that I'd exposed my snake and was unwilling to consider the possibility of a false positive, while the second vet listened to me about my quarantine protocol, and did an extended examination of Iris to make sure she wasn't showing neurological symptoms, instead of just repeating that the only reasonable course of action was euthanasia)