Evidence inadmissible.Any evidence obtained in violation of this Article is not admissible in any civil or criminal trial, or any administrative or legislative inquiry or proceeding, nor in any grand jury proceedings; provided, however, that so much of the contents of an alleged unlawfully intercepted, overheard or recorded conversation as is clearly relevant, as determined as a matter of law by the court in chambers, to the proof of such allegation may be admitted into evidence in any criminal trial or grand jury proceeding brought against any person charged with violating any provision of this Article. Nothing in this Section bars admission of evidence if all parties to the private conversation or private electronic communication consent to admission of the evidence.