A barcode reader has a housing, weigh platter, and off-platter detection assembly including first and second imaging assemblies in communication with a controller. The first imaging assembly has a first imager configured to capture an image of a first lateral edge of the weigh platter. The second imaging assembly has a second imager configured to capture an image of a second lateral edge of the weigh platter. The controller is configured to: identify and locate the first and second lateral edges; receive first and second images from the imagers; allow the weight of an object to be recorded if determined that a footprint of the object does not extend over the first or second lateral edges; and prevent the weight of the object from being recorded and/or providing an alert to a user if determined that the footprint of the object does extend over the first or second lateral edges.