Good point regarding clenched teeth, Pete. The medic I was with was discussing NPAs in the context of being an EMT-P in our county, and EMT-Ps here can RSI if needed. So if she had a pt w/ clenched teeth, she would probably use RSI and tube them. Sounds like the NPAs have some value for us BLS-level folks.
Gee, so many TLAs (three letter acronyms)... hehe!