...You can't trust anyone even the people you work with daily!
I guess that depends on where you work.
In my case, tools are not central to my profession every minute of the working day, but when I'm not at a keyboard, it can be very important that the tool I need is there when I need it.
We happen to have cameras everywhere (and lots of areas with restricted access), and have not had any tool theft issues. No big surprise.
I can't say I'm expected to have my own tools here, but it's worked out that way for the best. My good tools are at home, but I've brought plenty of decent stuff here that I keep locked in a jobox in the back. Two other people keys to it. I've never found anything missing, but I have had some things show up. For me, having it locked is more about knowing where all my tools will be when I need them, not about losing them,
For specialty tools that I don't own (or cheap things that I don't own two of, and don't feel like storing one of mine at work), I've had the company purchase them.
They sit on my desk, and at any moment, there could be several grand worth of stuff sitting there, and I have absolutely NO worries that any of it would disappear. I guess I'm lucky that way.
We have a cart with supplies that I've stocked with about $10 worth of HF screwdrivers that anyone who has access to the room can use. Some of these have gone missing over the years. Most likely they were lent to customers, and inadvertently pocketed. I doubt they were intentionally stolen (it's like stealing a Bic pen for gosh sakes).
However, when I was asked by the boss (who is NOT one of the people with a key to my toolbox) to make sure there was always a screwdriver available when needed, I picked up three $2 HF 6-in-1 screwdrivers, attached a few feet of chain to each, and put a loop on the end of each chain that is too big to fit into a pocket (think: gas station bathroom key). So far, no "screwdriver of shame" has not gone missing.
...Anyways let's not get too off topic.
Tool Thieves are the the lowest of the low. Followed by people who steal packages from porches.
Too true! It's akin to taking food from my children's mouths.