Defense Use of Police Interrogation

I'm a big fan of the "Do Not Talk to the Police" youtube video in which Regents Law School professor James Duane discusses the dangers of making statements to the police.

But the professor said something in the video that I can't independently confirm. He said that in police interrogations, anything you say can be used against you in a court of law, but it cannot be used by your attorney FOR you in court.

He said that at trial, if your defense attorney asks the police interrogator under oath to tell the jury something you said that would HELP you, then the prosecutor can object on the grounds that it's heresay evidence, and the judge will agree.

Can anyone point me to something that will corroborate the professor's assertion?

You said it

It's up to the judge , althow hearsay does not mean that the jury wont hear it (usually)

He cites a rule number to back up his claim, but I don't remember what it was. It's in his video.