Staff at Brown Thomas and Arnotts have been told to undergo training so they can spot money laundering in their stores. Shoppers who spend sums close to or in excess of €10,000 in cash when purchasing luxury items - even if the sum is spent over a 90-day period - potentially face being flagged to authorities for suspicious activity. It is understood authorities are concerned that high-ticket designer items are being paid for in large amounts of cash and are keen to ensure all funds are from legitimate financial sources.