I'm being drug tested woud they send it out to . lab to check the levels and why if it all came back negative?

I don't really: understand your question but will offer a thought based on what I think you might be asking! It sounds like you were told you had a negative drug test but more lab testing is being done. Sometimes, for many tests, there is a small indication of positivity, but not enough to be called truly positive, and only additional, confirmatory tests will determine if truly, not falsely, positive. One thought