In this chapter, we focus on Communication Accommodation Theory (CAT)'s utility for analyzing one under-studied domain of intergroup communication, namely police-civilian encounters. By so doing, we focus on one aspect of institutional talk where a power imbalance is clearly evident. In addition to presenting recent self-report data relevant to this initiative, new intercultural data from China, Taiwan and the US, are also introduced. But first, we overview some important assumptions and concepts of the theory, interlaced with a selection of empirical research studies