Prove the original crime, don’t rely and peripheral procedure like “they lied to a federal agent” (uhh) cop-out. Do your job.
Likewise I’m not don’t of people getting off on “technicalities” (Some more than others)
Lying to investigators and destroying evidence is unquestionably wrongdoing, and required far more explicit intent and action than merely failing to correctly fly an aircraft.
Nobody was in it when it crashed, he jumped out of the plane midair.