> Thankfully I've never had to use it.

Did a first aid certification 15 years ago in France.

At the end of the course, they told us that based on French law, it is your legal duty if you have the certification to perform first aid when the situation requires it. That is, once you have the certification, if you do not perform a somewhat correct first aid procedure in case of need, you could be charged for "non assistance à personne en danger" (disregarding assistance to endangered person).

It dreads me to this day that I could have to perform such procedure and not remember it.

Luckily I never had to.