Is there a way to identify which Resource Group a user is running in when using Resource Governor?

We are testing out the use of Resource Governor on SQL 2014 to ensure that end-user Ad Hoc queries don't hog the server resources and that we retain resources for OLTP users. I've written a classifier function which makes every attempt to lump sessions into the appropriate group, but we select the appropriate group based on SUSER_NAME(). Occasionally, we encounter a new service account that hasn't been identified in the classifier function. or we get questioned about what resource group a particular account is running in. Does anyone know of a way to identify which resource group a given session is running in?Thanks.Larry