Did he or she confess to something they did not do?
The defense can argue that the confession was false and made under duress, but that can be a tough case to make. As Ashman intimated, being rude or even obnoxious does not mean it is unlawful.
The defense can try to make a motion to suppress the confession on whatever grounds they think they can succeed ... Miranda, undue and unlawful duress, etc. The court will decide based upon the facts of the specific incident.
- Carl

