Some years ago, the SCCA removed the requirement for driver's medical info on the backs of their helmets. The reasoning was two fold; first, emergency services already had a slip on file from the driver's registration form, and second, because sometimes drivers use other driver's helmets (and the wrong blood type most assuredly can kill you, make no mistake about that.)
So at the NER national at lime rock a week and a half ago, I was astounded to see a new medical labeling system for helmets being deployed on a voluntary basis. The difference between this and the old system is that the medical data is inside an opaque plastic holder so that it remains private, apparently because of federal medical privacy concerns.
My problems with this are twofold. First, the main reason (helmet swaps) for removing the data hasn't gone away; drivers are no smarter about these things now than they were 10 years ago, and I do not expect this to change. Second, I was informed by an individual actually trained in the federal issues that the federal law wasn't really relevant to the SCCA; we don't really have any HIPPA issues (and for that matter, the feds haven't been in a blazing hurry to enforce HIPPA for those it applies to.)
Arghh. Sometimes I think the only reason I put up with this club is that it's better than the alternatives.