Here is a few articles on the subject.http://fairfax-loudoun.legalexaminer.com/workplace...http://www.brewerfirm.com/articles/article-OSHArul...So now that you are scared, if you read the article how can you protect yourself.

I don't see any harm in having one, I tend to think it all falls under the "EXERCISE COMMON SENSE" rule, but these days common sense is very uncommon. 

The workers tended to live along extended bus and street car lines leading to their work places.

The condo is in a complex near my workplace, and I heard that it was for sale by word of mouth.

It's no harm to second guess, but they should have answered these questions for you specifically and if they can't, you probably picked the wrong people to work with. 

Would calling them directly be inappropriate or potentially harmful to me?  

Its looking more and more like I should just put a wire mesh screen as a filter since buying what is supposed to be "good" (reduces allergens, dust, etc) just causes more harm.

And I set up my paperwork and file folders similar to at work, and created checklists and systems that were like those you already know for your workplace. 

And yes, she can stop paying the mortgage and harm your credit...happens all the time and it's really sad for all involved. 

You never know unless you give her the test.1) Take out the old security system and allow her to install her own as long as it does not harm the unit.