By citing seizure numbers and mentioning nothing else about each respective border, this article and other news reports I am seeing seem to imply or suggest that that seizures are a direct representation of how much contraband is crossing a border. That's possible. It's also possible that seizures are a representation, at least in part, of something else. For example, the success of border authorities in detecting and confiscating contraband. Authorities on one border might be more more successful than authorities on another border. The frequency and amounts of seizures might not be indicative of the total amount of contraband that is crossing a particular border undetected. The seizure rate might be related to geographical or other characteristics of the border, for example.