Will zolpidem be detected in a standard urine drug screen?

A case report from Israel (Willner and Schiff, 2014) described a patient who was found unconscious in his bedroom “with empty packages of unknown drugs scattered around him.” He was known to be taking divalproex, venlafaxine, mirtazapine, zolpidem, prednisone, hydroxychloroquine, thioradazine, atenolol, aspirin, and warfarin. However, the urine toxicology screening was negative for all substances…