CO law requires that a parent be present when a minor is interrogated. The fact that you were not present will most likely invalidate the interrogation
. Here is the law
CO Code (19-2-511)
(1) No statements or admissions of a juvenile
made as a result of the custodial interrogation of such juvenile by a law enforcement official concerning delinquent acts alleged to have been committed by the juvenile shall be admissible in evidence against such juvenile unless a parent, guardian, or legal or physical custodian of the juvenile was present at such interrogation and the juvenile and his or her parent, guardian, or legal or physical custodian were advised of the juvenile's right to remain silent and that any statements made may be used against him or her in a court
of law, of his or her right to the presence of an attorney during such interrogation, and of his or her right to have counsel appointed if he or she so requests at the time of the interrogation; except that, if a public defender or counsel representing the juvenile is present at such interrogation, such statements or admissions may be admissible in evidence even though the juvenile's parent, guardian, or legal or physical custodian was not present.
So they can not use the statements against him.
And it does not sound like a crime anyways.
You may want to contact the police to complain about this improper behavior...they should know better.