There are indeed many medical or neurological or psychiatric conditions which could exhibit the same symptoms as others have posted earlier in this thread and some can be indistinguishable from intoxication at point of presentation. The classic one is of course hypoglycaemia (low blood sugar) in diabetes- many a custody sergeant has fallen foul of arresting someone for being drunk and disorderly only to find them dying in the cell from hypoglycaemic coma. Will be watching this thread with interest to see how it unfolds.