Even Quinine water can also cause a positive reading for opiates.
Poppy Seeds such as the
a bagel from your favorite deli, etc. The
journal of Clinical Chemistry Vol.33 No.6, 1987 reports: "the quantities of poppy seed ingested in this study (25 and 40 g) may be expected to be contained in one or two servings of poppy seed cake. Therefore, poppy seeds represent a potentially serious source of falsely positive results in testing opiate abuse.