At my work, I will not allow the hourly tire guys to borrow ANYTHING for work purposes. "Oh, you need some side cutters? Go tell the boss to buy you some!" If they are working on their own car, I have a "you tell me what you need, I'll get it for you and it comes back and is put in MY hand" policy.
On the service side, I loan out specialty tools only. Don't ask me to borrow my 8mm wrench because yours is 30 ft away. You want to borrow my hub tamer? Sure...My powerprobe...sure! My 1/2" impact? GFY.
With specialty tools I always come "help" the first time or two to demonstrate proper use.