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> - If you can't stop someone, you're not going to be able to read the number on the badge.

Ever heard of cameras?

Ever seen security camera footage?

Ever seen CSI? Enhance!

Sometimes I have to upvote sarcasm :)

1080P security cameras and above are easily available, and likely affordable to a company like MS.

Lighting is typically the bigger issue, but you're right: Microsoft has the resources to do security cameras "right". :)

RFID instead of number?