Hi - I had two cats poisoned this summer (July) while I was also on vacation - I am in the same area as you (Dobson & Guadalupe). It was antifreeze used on them - I had their kidneys tested at UofA Vet Lab. Did you ever hear back from Mesa PD? I reported it to Animal control and told them which house I thought was doing it. I would like to be in touch with you about this situation. Would you post back and let me know if we can be in touch?