Sorry, I used the wrong term. I wasn't saying discriminate against a candidate from a legal sense. Not sure what you would call it. Filter? Determining factor? When looking for a candidate that does not have an address on their resume, it does seem like a punishment. Especially the way someone said that it could be a single determining factor in passing over a resume.
I've been through the hiring process from both sides. Granted, I didn't have to go through hundreds of resumes. In talking with other people that were laid off the same time as me, it seems like recruiters are looking for reasons not to interview someone. Not having an address seems like a stretch. It also seems like recruiters are presenting a moving target when it comes to getting an interview. Resume expectations are constantly evolving. If you do a google search, you'll find a 50/50 split on whether or not you should include an address on your resume. Applicants have no way of knowing what a particular recruiter wants. Damned if you do, damned if you don't.