Logging onto Mac with RFID Cards I want my users to be able to login to their computers (which are Macs) using RFID or Magnetic Stripe. Can anyone recommend a way to implement this?

They all run Mavericks or Yosemite, and it doesn't matter whether they are connected to AD or not, as long as I can get cards to work! I will unbind the macs if necessary!

Thanks
Ed
There are quite a few smart card readers (e.g. this one on the Apple Store) that work with OS X.

For support of Smart Cards you may also want to check out Smart Card Services on MacOsForge.org, as highlighted by this Apple Support document regarding smart cards on OS X Mavericks.