One thing we started doing on all our purchases is a basic home inspection, termite and also an additional plumbing inspection including a camera into the clean out pipes.

Part of your due diligence may include hiring a local plumber to run a video camera through the sewer mains if you are responsible.  

We've already piled $6k in attorney fees without a clear view of what is going to happen next (it seems an unlawful detainer).I would like to install security cameras in the common areas of the property.

If you are wanting to track progress or have a way to communicate about a potential property to an out of area investor, the Ricoh Theta series of cameras will take a spherical panorama of a room.  

They also have a fiber optic camera where they take apart the shower fixture and insert the camera and can see behind the walls without tearing them up and can check for leaks.The rate is around 90 an hour for the 2 plumbers doing the test.Each unit the owner said would take about 30 minutes to inspect.If issues need to be corrected and fixed it would take longer.I really want to get these plumbing issues under control.I don't think the fee is that bad but wanted additional input.Had a great gut feeling meeting them just don't want to blow up the budget too much.I asked about the bigger opening toilet bowls to prevent clogging.He stated the bigger opening would help with excessive toilet paper and waste getting stuck but would not stop things such as toys,q-tips,tampons,etc. from clogging the line.So nothing is fool proof.

I was so wrapped in absorbing every bit of information and networking during the breaks.. that I never thought once about breaking my camera.

Our property has security cameras.

I have a few IMDB credits myself (http://www.imdb.com/name/nm2312372), co-founded BeMore Films (though my partner is pulling 98% of the weight), and am on the staff of a non-profit called Veteran Artist Program, where among other things we help to get more veterans in front of and behind the camera.

Not sure how expensive it would be but a job site camera sometimes is useful in cases such as this.

The only thing you might be able to do is have a plumber snake a camera down the drain pipes to see if they can find anything that may be a problem.