Over time our activity assessments have been refined. In some instances, activity that we once thought suspicious has been reevaluated as a business's standard-operating-procedure. One activity, however, is of concern. Some businesses buy goods for cash (recycling aluminum / copper, etc., and the purchase of precious metals like gold). A warehouse manager recently told me that when he sold aluminum and asked for a check, he was told that they only deal in cash. I believe that, even if this is business-as-usual, there is an underlying (suspicious) reason that these business only deal in cash. Any thoughts?