Exception Handling

In my development environment when an error is raised in my Buiness Layer I rethrow the exception and the message of he Exception is displayed.

For example : Cannot Update where Record Status is Closed  is displayed. Record ID 369448

When I deploy my app to both the System Test and UAT environments the user gets below :

-- System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.Exception: Error: Cannot Update where Record Status is Closed'. Record ID 369448 at FCS.FinesBL.CreateFine(XmlDocument FinesXML) --- End of inner exception stack trace ---

Anyone know why the extra exception details are displayed in System Test and UAT and not in or development environment?

I am baffled.