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 say a wall won't end it. so telling. thank you for the reporting, sanjay. >> facts don't support the claim that a wall would stop it. great story. coming up, justice ruth bader ginsburg's absence from the bench this week is raising big concerns, questions about the high court. we'll discuss that next. it was here.