Employee Exhibiting Symptoms Of Slurred Speech, Loss Of Awareness, Inability

employee exhibiting symptoms of slurred speech, loss of awareness, inability to recognize objects, follow fingers from left to right, etc.... he was not responsive to remedies associated with low blood sugar. His manager reports several instances where he smelled strongly of what she characterizes as "listerine". I need to understand if I'm describing an illness or if I have a potential drug/alcohol abuse case