Not only for reasons of sedatives, but also for bute, which would disguise any existing lameness, however slight, making the horse appear sound, and this is what I'm trying to convince my friend's daughter to have done, get that blood tests checked out for bute. The sad part of it is, the vet wants another £250 to test it and she's already into the thousands now IF, it came back as a positive for bute, then she could just chuck this horse back at the dealer and get her money back, all of it! I know which way I'd go.