Ha! Funny you should mention that. I brought that to court with me. My exemption was also consistent with all the requirements of Form C-58. However, in view of the judge's ruling, which violated not only section 7 but C-58 as well, I wrote to the DMV (Barbara Fiala) for an opinion regarding how I could be compliant with both the judge's ruling and Form C-58 (because there's no way you can comply with both). The reply came from DMV legal counsel, which informed me (among other things) that Form C-58 "is not a statute and is not a regulation and therefore does not have the force of law." It was prepared only to serve as a "guideline" for physicians to "aid [the physician] in preparing exemptions" and is "not binding upon the judiciary." The only criteria for adjudication, according to the letter, is "statutory," so that legally, an exemption to section 3a need conform only to the criteria listed in section 7, which is 1) is the condition ("handicap") certified by a physician and if so, 2) does the certification state the nature of the handicap and the reason why wearing the safety restraint is inappropriate. Form C-58, counsel went on to state, has been withdrawn "specifically because of your case. It is no longer available" while it undergoes "review and possible revisions to make it more clear."What does the "Guidelines for Granting Medical Exemptions from Seat Belt Use" (C-58) say about it?
So, in a nutshell, there IS no more Form C-58 (thanks to me!), only section 7. The two criteria above are the only criteria that a judge should consider in determining the adequacy of an exemption to section 3a. It need not be dated. It can never "expire." There is nothing to compel active possession, nor is there any language to prevent an affirmative defense based upon constructive possession. It need not be renewed in 6 months (for a temporary condition) or every 4 years (for a permanent condition), as recommended in the now-defunct C-58. There is no "height requirement," either specified or recommended (C-58 used to recommend 5' tall or under).
I think it is still mentioned in the DMV brochure about seat belts, but if you try to locate a copy of C-58 on an Internet search or even search the DMV site, you won't find it. If you go to your local DMV office, they'll give you a dumb look but not C-58. Legal counsel wasn't kidding, it has definitely been withdrawn and no longer adds anything to the criteria in section 7.