Non-barcode items such as produce, and store staff overriding (or ignoring) checkout alerts, were singled out as vulnerabilities, and poverty was not seen as a major factor.[10] The founder of one store video surveillance system estimated that "Theft—intentional or not—is up to five times higher with self checkout than when cashiers are working", although behaviour of shoplifters is becoming well known, and stores are now better at shoplifting detection.[11] A 2014 survey in[where?] of 2,634 respondents confirmed the same general findings, but commented that the cost of additional theft was evidently seen as "tolerable" compared to the cost of other processes, such as manned checkouts, and harm due to poorer customer service arising from the slowness of manned versus automated checkouts.[9]