
Can Fo-Ti Root Extracts Cause False Positive Results For Cocaine?

None except possibly tonic water.
Detailed Answer:
I read your question carefully and I understand your concern regarding false positives.
However looking at that list of medications and herbal products I am afraid that none of them are known to cause false positive results for cocaine, so they do not explain.
Substances which can cause false positives include some antibiotics (amoxicillin, ampicillin), coca tea, oil or leafs, diabetes or kidney conditions.
You also mention tonic water. Tonic water is mentioned among possible causes of false positives, however it must be drank in very large amounts for that to happen. If no other explanation is found then it must be considered as a possible cause.
I remain at your disposal for other questions.

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