Has anyone seen the Singapore Police Force](https://en.wikipedia.org/wiki/Singapore_Police_Force_Crisis_Negotiation_Unit) or another professional crisis negotiation unit do crisis negotiation? Literature on the topic is unspecific. For instance, I doubt police negotiators use ]relaxation techniques(relaxation techniques.) in a heat of crisis negotiation.
Has anyone seen the Singapore Police Force](https://en.wikipedia.org/wiki/Singapore_Police_Force_Crisis_Negotiation_Unit) or another professional crisis negotiation unit do crisis negotiation? Literature on the topic is unspecific. For instance, I doubt police negotiators use ]relaxation techniques(relaxation techniques.) in a heat of crisis negotiation.