This is standard practice on the freeways: Search for Black Asphalt Network  and you'll find articles like
http://www.washingtonpost.com/sf/investigative/2014/09/07/police-intelligence-targets-cash/

Now add this:
http://thefreethoughtproject.com/feds-banks-inform-law-enforcement-customers-depositingwithdrawing-5000-cash/

and connect the dots....