How do you really know?

A recent Out Now poll in the UK reported that more than 3/4 of LGBT respondents said that “a potential employer's diversity policy was important when deciding where to work, with 62% saying it was 'very important.’”*

Granted, policies on paper are great to know exist, but how do you think one is able to be sure during the interviewing process that the company does practice what they preach?

*Source: Human Resources, 10/01/08, In the News - Diversity - Why it pays to have gay-friendly policies, p.7