It is undeniable that even the most experienced interviewer will bring their expectations and judgements with them when meeting a candidate. If you play a big role within your organisation, it is only natural to make judgements on whether a candidate would suit your culture and ethos based on such seemingly superficial factors as their appearance or CV.
More information: http://www.webrecruitireland.com/employer-blog/small-business-owner/why-interview-bias-can-be-important-for-talent-recruitment