This from Emily Post "Although it is easier for right handed people to put a name badge on the left side, they correctly are worn on the right side so the person shaking hands or greeting has easy eye contact with both the person and the badge as a way to help remember the name or to see where he/she is from, etc. This is the purpose of wearing the badges in the first place" - See more at:
http://www.etiquettedaily.com/2009/0....jtFOcGxS.dpuf