I thought the "Medical Carrier System" was an SCCA requirement - apparently not yet.

Due to HIPPA regulations, it is increasingly difficult to share medical information and even more difficult to properly secure said medical information. As a result, the Medical Carrier System (MCS) allows an individual (driver, crew, worker) to maintain complete control over their private medical information while still providing access in case of an emergency.

For an entire $1.00, it is well worth the piece of mind. Of course the downside is if you lend your helmet to someone else but that is a "personal responsibility" matter.

One last tidbit - when writing down information on the MCS, use a PENCIL!!!! Ink doesn't dry on the material - probably b/c it is waterproof and impervious to inks.