In regards to DNRs, I've considered them but even then, imho, are too much of a hassle and work, and even if there is one, there is a good chance that some (or rather a lot of) pro-life doctors and medical professionals will just ignore or override them, thus rendering all of the work to getting one useless. Sure, assuming that one has an DNR and it's not honored, then the patient (or their family) can sue, but even then it's a huge clusterfuck of a mess that isn't worth it.