I can’t find their source for the “2019” review with the 4.7 %, but the main thing to know is that the good Samaritan laws protect you when you are acting in good faith and following your training.

So for example it would protect you while giving cpr like you’ve been trained to do, or while following directions from 911, but won’t protect you if you stick a pen in someone’s neck because you thought they needed a DIY trachyometry like you saw in a movie once.