Eating food cooked with alcohol (wine etc.) can lead to significant alcohol exposure (ie not all the alcohol is "cooked off"). Therefore, cooking with alcohol can be just like drinking alcohol. Alcohol doesn't last long in the body, howeer, which is why EtG and EtS testing are valuable. Therefore, cooking with alcohol can easily resut in a negative urine alcohol but positive EtG or EtS. A low level of EtG or EtS can mean low level of alcohol exposure or that you tested further from the time of exposure. Level of EtG or EtS cannot predict amount of drinking. There are too many confounding variables.