EXACTLY! We will be monitored by Big Brother if we get a cold once a year and happen to buy Nyquil or something from that very long list. "It's all for the common good." (I don't usually buy that stuff but I think I'll start so they can add that to their file on me.) We "can't", however, keep track of these murdering, pillaging invaders.
But there is good news, out of millions of cows the government is perfectly capable of tracking that one which had mad cow disease all the way to its birth in Canada three years ago. Illegal alien criminals may be devastating the country but we are definitely safe from infected cattle.