Which of the following actions might suggest that an incident is not genuine?

An incident may be considered not genuine if it is deemed "unfounded" upon response, meaning that no evidence or situation necessitating action is found when authorities arrive at the location. This suggests that the incident reported may have been fabricated or exaggerated, as there is no substantiation for the claims made. The notion that emergency services find nothing upon their arrival strongly indicates that the incident was not real or was misreported.

The other options generally indicate either a legitimate traffic or safety issue (such as a citation or a warning) or a decision not to take action but do not necessarily reflect the authenticity of the incident itself. For instance, a citation or warning implies some violation or need for corrective action, while no action taken could simply mean that the situation did not warrant a response at that time. However, the unequivocal characterization of an incident as "unfounded" directly points to its potential fraudulent nature.