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... sensor array are NOT cheap, and the array has to be able to track the bad guys until they're caught, depending on how you've got your agents clustered that's a range of at least 2 preferably 5 miles deep. That means setting up and maintaining a 4 to 10 thousand square mile sensor array. That is a GIGANTIC piece of change. I'm glad you brought up the DMZ, because it doesn't work. The DMZ is probably the most secure chunk of realestate on the planet and the bad guys still manage to sneak across periodically. It also costs us an AMAZING amount of money to maintain, and is about 1/100th the size of our border with Mexico (generally speaking complexity of securing a region increases exponentially to size, so securing a region 100 times the size will be 10,000 times the complexity).

???

Really? Actually, the Korean DMZ is about 155 miles long and 2.5 miles "deep". 100 x 156 = 15,600 miles. I think our border with Mexico is rather shorter than that.

It doesn't work? Because there is the occasional infiltrator? Big difference between a few guys that sneak through, backed by the resources of a whole nation (even one a whacked as N. Korea) and the millions of illegals that flow across our border like being sprayed from a fire hose.

Expensive? Depends on what you mean by cost. How many billions do we spend now on health care for illegals, and prisons for illegals? Several.

"Really? Actually, the Korean DMZ is about 155 miles long and 2.5 miles "deep". 100 x 156 = 15,600 miles."

Please don't confuse square miles with linear miles.

It makes engineers like me uncomfortable.

Feet vs meters sent a JPL spacecraft to nowhere.

--Boris

OK my math was bad, doesn't change the FACT that the border with Mexico is SIGNIFICANTLY longer than the border with Korea, and the DMZ is still not 100% secure. I didn't say it "doesn't work", the matter at hand is people insisting we can "seal" the border with Mexico, if we can't "seal" (achieve 100% security, no penetration) the border with Korea how can we possibly seal the border with Mexico? Answer: we can't.