The testimony in court was that Harris looked into how a dog or other animal would die in a hot car (he watched a video about the subject).
Is this what you are referring to? (From a discussion in Law Newz, at the link):
“He also twice accessed a video that he was sent about a veterinarian discussing the effect of heat on animals, but there was no evidence that he searched for it, or that he even watched the whole thing ...”