Let's take an obscure language like, oh, I dunno..... Armenian! Who signs the boy off as meeting the requirements? As there are very few Armenian speakers around here (but we have Russian, Tagalog, Spanish, Hindi, Urdu, Swahili, Romanian and who knows how many others) do I allow mom and dad to say he did everything, or should we wait until their Armenian-speaking acquaintance comes for a visit? I really do not have any reason to believe his parents would fudge the requirements - I worked with dad (Russian and Armenian) at the hospital, and mom (more than a couple languages herself) is a professor of languages at the local CC with 2 Masters degrees.
The boy is new to the troop but impressing me with his integrity to this point. He readily admits that he doesn't know enough Russian to pass the requirements, or at least not easily. He's first generation American, BTW, with a babushka who spends the winters here rather than in Moscow.
Boys can save lives when Scouting first saves them.