If existing or future robots appear to have some capacity, state or property, how can we determine whether they truly have it or whether we are deceived into believing so? John Danaher addresses this question by formulating his approach to what he refers to as superficial state deception (SSD) from the perspective of his theory termed ethical behaviourism (EB), which was initially designed to determine the moral status of robots. In summary, Danaher believes that focusing on behaviour is sufficient to (...) determine whether SSD occurs. My general claim is that Danaher’s approach to SSD based on EB is implausible since it results in the impossibility of conceptualizing SSD, e.g., it does not enable determining whether or not SSD occurs in a particular case. Moreover, I show how Danaher’s approach to SSD needs to be transformed to become plausible. To make my point, I (1) examine the main features of EB and distinguish its two versions by showing how Danaher revised the original EB in response to criticism; (2) discuss Danaher’s approach to the problem of deception from the perspective of EB; (3) criticize that approach by showing that it requires revisions analogous to those that have already been recommended in reference to EB, and (4) propose an alternative method for determining the presence of SSD that covers diverse, plausible approaches to SSD. (shrink)