I've always said don't talk to the cops even if you've got nothing to say because when they tell you anything you say can and will be used against you, they mean it '..and they mean it can be used against someone else as well. Again nothing is to be gained by saying anything. Anything can be taken out of context, anything can be juxtaposed to what someone else may or may not have said in any context...they aren't asking because they like you.
Below is a good example of how not to say anything.
Here’s what I recall about my encounter with the FBI today:
(Aka- Mike Nelson)