I always try to maintain the philosophy that my tenants deserve privacy unless they are damaging the premises and hurting other tenants.I also have regretted whenever I've stuck my nose past that line and tried to give them advice.Domestic violence is a tricky one though because they aren't damaging the premises or (usually) disturbing other tenants.  

@Brandon UprightIt is the privacy laws, not the real estate laws which make it more challenging to systematically find absentee owners.  

I personally use a land trust to hold title which provides me with the privacy protection I need. 

Are the neighbors respectful of my privacy and right to quiet enjoyment - or are they shooting at each other?

There are many, many types of trusts, each drafted with a given set of objectives: privacy, asset protection, tax avoidance, charitable remainder trusts, generation skipping trusts, beach bum trusts, etc.Also, you need to be very specific as to the taxable events.

I think tenants would find the privacy appealing.Please feel free to weigh in...

To a lot of people, even those that don't use drugs, it feels like an invasion of privacy, and they'll just take their business elsewhere.

Some prefer to hold in a trust with an LLC as beneficiary for estate planning and privacy protection.

Personal injury losses may occur due to alleged wrongful eviction, invasion of privacy, or discrimination.

It is too hard to police everyday and not a workable system (you'd be stressed and in conflict and maybe violating their privacy if peeking in or around the place too much).