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what could cause a false neg blood test when the medicine was taken that am

been taking adderal and oxycodone for 12 years all tests came back ok now I got a false neg blood test even thoughi took medicine as prescribed. what could cause that? any food or herbs or anything?
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If the medications are not being taken on a regular, consistent basis, that would cause a false negative.
All lab tests have cut off thresholds-ng/ml that are minimum detectable levels.
Taking a medication one time a few hours before a blood or urine test likely means that the blood plasma levels were too low to be detected.
IF you were taking the medications on a consistent , regular, ongoing basis, they would have been detected.
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