What's your daily ATM withdrawal limit? Familiar with the letters SAR? Mere suspicion of structuring requires a report. If you know any local people that work at a bank, ask he or she how many SARs are filed in the one branch per week, on average.

A major federal reserve branch maybe has $30 billion in cash on hand at any given time. The marginalization of the US cash market is almost complete after the past decade.

Lastly, consider the possiblity that those back scatter xray machines aren't about weapons.