How do drugs show up on airport scanners?
They use x-rays to look into the bag and see the contents specifically of the luggage. It might seem that storing the drugs between items within your bag will actively block the x-rays from protecting them, but the scanners emphasize the edges of an item, allowing them to see through any and everything within the bag. How do they detect drugs at the airport? As a bag scanned goes through the scanner, it absorbs radiation energy from the X-ray.