> The IG found that the search was based on a tip by an airline employee who passed on the names of passengers who had purchased flights 48 hours before departure. That employee was being paid by the DEA a percentage of the cash seized, the IG found, and had received tens of thousands of dollars over several years. That arrangement is problematic, investigators concluded.

You don't say?

> USA Today reported in 2016 that, over a decade, the DEA seized more than $209 million in cash from at least 5,200 people at 15 busy airports

Assuming the top 15 airports account for 50MM annual travel, that means, on average, 1 in 100K traveler-trips have cash seized: 3 seizures per airport per month, with a per-seizure haul of $4K