Why did your Concerta drug screen come up negative?

A negative drug screen for Concerta could occur for several reasons. The individual may not have taken the medication, or it may have been metabolized and cleared from the system before testing. Additionally, the testing method may not have been sensitive enough to detect low levels of the drug, or there could be issues with the sample collection or handling process. Lastly, certain medications or substances could potentially interfere with the test results.