No safety precautions and sometimes we couldn’t communicate with them.

If he knows your name and any info you sent him has your address on it   as @Glen Wiley said consider taking what ever precautions that are necessary to protect yourself and your family . 

Then, you'll know whether precautions and proper cleanup procedures are required.Hope this helps.  

Each gets its own as a protection precaution 

Take proper precautions, think of multiple exit strategies, and do your due diligence.

The 5K was a precaution against any unforeseen expenses before my last walk through and I would definitely make sure if they were necessary before including that in my final offer.

You seem to be making the right checks and taking the right precautions.

Should I put up plywood board or corrugated metal sheets to protect the old windows (house was built in '84 and has original windows)Regarding upstairs unit what precautions should I take when finding someone to put up the board or metal sheets? 

I am highly considering the Dallas area, yet through hours of research through listening to the podcast, I have become aware of the precautions that should be taken with this mode of RE investing.

Is there any precautions I should be taking, like draining the hot water tank?