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Thanks for your question.
This is my initial reply.
Please reply back if you need any clarification.
Omeprazole is a proton pump inhibitor and it can cause a false positive result for THC in urine.
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I am pretty sure.
If you wish I can give you a scientific article regarding this.
Sorry for the late reply.My internet connection was troubling me.
It is not THC which is causing positive result.
Omeprazole is cross reacting with the enzymes in urine test which is causing the false positive result.
Please read the scientific link regarding this false positive.
Please reply if you have any questions after reading this.