If alcohol related incidents were a problem ther would be no Congress.
This might be one of the most famous ones from back in the day:
“At two a.m. on an early October morning in 1974, a Lincoln Continental with Arkansas plates sped past the monuments on the National Mall with its headlights off.
The Park Police pulled it over, and from its doors spilled a drunken Southern congressman who had been cavorting inside with three women. Meet Wilbur Mills, chair of the House Ways and Means Committee, which had made him one of the most powerful men in Washington for decades. One of his companions, later revealed to be Fanne Fox, a stripper known as the Argentine Firecracker, ran from the car and jumped into The Tidal Basin. The police pulled her out, and helped the Congressman and all involved—another other occupant of the car was a dancer known as the Vegas Vixen—escape the scene.”