I've worked for some big, public corporations... and they feel pretty safe. Everyone has a background check and drug test when hired, HR is usually pretty on top of things (because the companies are well-known and large, something bad happening would be a PR nightmare, I imagine), and there's usually security on-site.

I mostly work from home these days, but when I go into the office - you need to use a badge to unlock the front door, and there's a security guard there. People without a badge need to sign in and have someone from the building escort them in.

Another job I had, if I'm remembering right, had super security (like, I think a metal detector and x-ray machine for your bags!) - actually two jobs like this. One was because the business was located in the same building as manufacturing, and they were watching out for thefts (and cameras, I think? so that nobody could record the manufacturing process), and the other was a brief stint in a government building.

So maybe something like that would help? These were also all typical day jobs - like 8-5 type hours, so no late hours, and no access for random members of the public.