The police generally will not identify the CI unless they have no case otherwise.
The police also play a little game called the two tier CI. This is where the actual CI who provides all the information to get the ball rolling, introduces another CI into the picture. The cops will not give up the true source CI, only the throw away CI.
The informant game in police work is a very dirty business and many police and agents look at the end result as justification among themselves. They are not so worried about benefiting from the fruit that comes off the forbidden tree
They usually refer to the main CI as the RC, the "Reliable Confidential Informant" Talk about an oxymoron,,,,,,