Smuggling and Human NatureJeremy Lott has a great interview with Joel Miller author of Bad Trip, a detailed disection of US drug policy, over at Reason.
That points to problems with enforcement but it also shows the incredible amount of ingenuity and craft that people will put into their smuggling. It includes things like building submarines, training pigeons how to carry packets of drugs across borders. It includes smuggling substances inside of things, disguising them as other things, including taking opium and soaking blankets with it and smuggling the blankets, taking cocaine and mixing it with plastic and fiberglass resin and creating things out of it like dog kennels and bathtubs, and then extracting the cocaine once it's across the border. There's no way to test for it without testing every single item: you can't smell it, can't see it. The only way cops can get it is if they're actually taking chips out of these products and testing them.