Existing linguistic research on police interrogations, such as the work by Gaines (2017) and Shuy (2017), discuss presupposition and deception within the interrogation room. The interrogation process typically follows two methods, the Reid technique and the PEACE method. This study examined how police interrogators violate Gricean maxims in these techniques, which maxims are violated most, and which technique results in more violations. Ten interrogations following the Reid technique PEACE method were selected from the public video-sharing platform YouTube. The videos were transcribed and violations were identified and analyzed in the existing contexts through discourse analysis. Data suggests that interrogators following the Reid technique violate the Gricean maxims more frequently than interrogators following the PEACE method, and that the maxim of manner seems to be violated most frequently in both interrogation methods.