tox screen造句

What are tox screens ( and what is the appropriate article )?
Three bullets in the head, lithium in the tox screen, a perfect life on paper that ended before her own plot ever really got started.
Because her tox screen was positive for cocaine, and because of what she said at lunch, J . D . concluded that she had died of suicide by overdose.
House orders an STD panel, a tox screen, an ANA to look for autoimmune, a patient history, a lumbar puncture to rule out viral encephalitis, and asks to have a c-reactive protein sent to the lab to look for inflammation.
It's difficult to find tox screen in a sentence. 用tox screen造句挺难的