Also, you don't need to sue. You can file an EEOC or similar complaint to your state/local Human Rights Commission. The process is designed so that you do not need an attorney. You get assigned a hearing officer, they perform some sort of investigation and issues a finding, which can include a variety of remedies.

It's not something to be paranoid about, but when you're a bigger company interviewing alot of people, you want to tie up the loose ends.