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Container that looks like this. >> the vast majority of fentanyl is produced in china. it comes into the u.s. two ways. you know, it comes into next, where it's either pressed into pill form or combined with heroin. the other way it comes in, american consumers buying it direct, oftentimes from vendors out of china. >> then i want gets mailed in? >> u.s. mail, which is the most common. a very small quantity of fentanyl is very hard to detect in the masses of letters that come into the u.s. every day. >> how effective is a wall at preventing drugs from getting into the united states? >> in term...

Mail order express consignments. >> reporter: when they say 90% of heroin comes across the border from mexico, that's correct. we know how many opioid-related deaths there are. but most of it comes through ports of entry and deep concealment. poppy, the world has changed. this is $20 million to $30 million of product. this is just flour, but $8,000 of raw ingredients turns into that. you can see the incentive. stick it in a car and that's the deep concealment. >> experts at the border -- it's politics aside for them. these are the facts. they are coming through legal ports of entry and they sa...

Through the mail order express consignments. >> it's worth pointing out, that bag of flour, that 1 kilogram bag of flour, if that represented $8,000 that could be turned into 1 million pills sold for 20 to 30 bucks on the street per pill. you can see the economic incentives here and why people continue to try and try over again to get this stuff into the united states. keep in mind, what we are talking is not like anything i saw in medical school. it's 100 times more powerful than morphine, which is why it's so dangerous. >> dr. sanjay gupta, thank you. coming up, with arrests expected any d...