"From my cynical vantage point here in reality USA, I see 10 million +/- illegal aliens that no one can seem to locate,"
Mike: Yep I often wonder why that is when we can find a 3 year old COW!! track it from birth to it's EXACT stall 3 years later (Came across the Canadian Border) & we can find ALL it's offspring YET we can't find a SINGLE illegal.
Within a couple years, they will be able to do all that within 48 hours. Animal identification with traceability is the new "buzzword" in the agricultural arena. We are going to have to register our locations and have, probably, radio scanned ID tags on all animals that come and go. Going to be interesting to see it come to pass. However, it should help slow down cattle rustling as the animals would have to have the original tag from the owner, or a tag replacement that would ID the rustler.