Access slips/"hall passes"

[Vitatroll]

I'd like for them to dissolve after the use period is up. This would keep people from littering the hallways with useless access passes. Stickers sorta do this too, depending on how their timing system is worked out.

I've always wanted to give somebody access to my work area without having to babysit them.

Spitballing: PDAs have printers. Request access via PDA > department head okays it > pass gets printed from PDA. Requests limited for sanity.