Eviction gone wrong, shots fired; how can you protect yourself?

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What are your thoughts on what has happened with a 12 year old girl being accidentally killed during an eviction notice being served in Pennsylvania? I know that most of us would like to pretend that this would never happen to us, but what are some steps that could be taken to protect yourself in a situation like this (specifically related to real estate and the physical removal of a tenant)?

http://www.cnn.com/2016/01/13/us/pennsylvania-cons...

Thanks for your respectful thoughts while discussing such a sensitive topic.