Do we have to hire the partying applicant?

Q. We are hiring a new salesperson, and were about to offer the position to a seemingly well-qualified applicant. As part of our reference check, a social media search was also conducted. Several photos of the candidate passed out surrounded by empty booze bottles at what looks like a fraternity party and other photos of partying were found. We are considering not hiring this applicant because of the results of the social media search. Would that present any problem for us legally?