The girl is over 21, so the 21st Amendment gives her the right to get loaded. I'm not sure what you mean by "suspicious"
She totally has a right to get loaded.
She doesn't have a right to drive home drunkenly, wander into the wrong apartment, and shoot some guy who lives there because she was too polluted to find the right floor or read the right room number.
So we need to give all these drunk Drivers a pass, because, hey they totally had a right to get drunk, and not their fault they ran those people off the road!