My first thought exactly that Mexico is not known for it's cheeses so an instant red flag. 10% of drugs are found apparently so there is plenty going through. The tunnels is where the big volumes happen considering the length of time it takes to build one. There must be so many tunnels being built all the time even if they cost a few million each they would make that back in hours in comparison.
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Does South Africa have a failed war on drugs as well?