Systems and methods are disclosed herein for estimating the risk of criminal activity in a retail setting. Using video data, biometric data for an individual may be obtained. A baseline biometric measurement is taken upon enqueuing of an individual, which may include entry of the individual into the field of view of a camera having a point of sale (POS) in its field of view. A biometric measurement is also taken when the individual is adjacent the POS. According to an analysis of these measurements, an estimate of risk is calculated, such as by comparing the baseline measurement to a POS measurement. Based on this risk assessment, an alert may be generated. The alert may be a graphical indicator displayed on the POS or transmitted to a device operated by a store representative. The risk assessment may also be used to select transactions for auditing in a self-checkout system.