It may very well be that he wasn’t drunk, but instead is just that senile. Read the via whole article.
“I asked him to start with the letter D and end with the letter R,” deputy M.G. Cummings wrote in the report. “I asked him if he understood and he replied yes. He began with the letter D. When he got to the G he began to omit letters and tried singing the rest of the alphabet real fast.”