I think it is possible that the ambien and the
lunesta may be the cause of your false positive
for benzos. Although fairly controversial, i have read of people who have failed pre employment drug screens even though they consumed no narcotics. Ambien or lunesta was the common denominator in many of these stories. Whilst both are not true benzos but a 'z 'class hypnotic,sedative,anxiolytic,they have similar properties to benzos and tickle the same receptor sites.