Westminster Police Department’s financial crimes/fraud detectives have a new device to add to their crime-fighting toolbox in their work against the ever-changing illegal gambling rings known as slaphouses. It’s called the ERAD, which stands for Electronic Recovery and Access to Data. And what it can do is determine funds balances in any prepaid card with a magnetic stripe — gift cards, for example. “This is very new for law enforcement overall,” said Westminster Det. Henry Tran. The mechanism is simple: Detectives sign in to ERAD’s app and plug in the device that looks like a small card reader. But its…