In fact I heard about some states looking into passing laws that say: "Refusing to take a blood/breath test is a misdemeanor."
People always think they 'passed' sobriety tests, they are wrong most of the time. The things that cops look for are really small. For example for a walking test people think they have to fall down or something to fail, it is really small things like feet being inches away. Did your friend fail the blood test?
I think the amphetamine pills were used more to keep people awake when working long shifts, not because it made them better pilots.
At the very least being forced to pay a bunch of money might be considered a punishment, and would hopefully reconsider doing it again.