Banks have already made major leaps in trader surveillance in the past few years but "false positives" remain an issue with one bank admitting it was getting a 450,000 alerts per month for “silly things” like a trader asking his wife for a favour.
Typical costs of less than $10m for rogue trading detection systems are small compared to the multibillion-dollar losses banks have taken on rogue trading, but Mr Andrews says banks are still “price-sensitive” on what they will adopt. He believes this is partly because there have been no big rogue trading cases in recent years and regulators are currently more focused on requirements such as “know your client” and anti-money laundering practices.
https://www.ft.com/content/be7a5584-2ee7-11e9-80d2-7b637a9e1ba1