Holy cow

You know, we've got all this mad cow discussion going on and have had it for years.
But our wonderful government in the US of A can track a single cow down with this deadly disease right from birth to its current residence.
Yet, we've got what -- 11 million or so -- illegal aliens (Translation for the politically correct: undocumented residents) here in the States that we can't find.
What's wrong with this picture?
My cousin Allan gets the shoutout for this riff, which he passed along in joke form.