"you don't have to violate any law(s) to be served a mental health hold."
Sure you do. The mental health laws pertaining to "a mental health hold" as you put it.
"Law enforcement, medical professionals, a social worker, even a concerned family member or friend, can have someone served a hold under the right circumstances. Those revolve around the concept of "danger to self, or others"!"
And where are those "right circumstances" written down? In the law. You have to meet the written standards to qualify for "a hold" or what we call a green warrant.
I'm not talking about speeding tickets and felony laws, I'm addressing the mental health laws. There are standards to be met. You can't just pick somebody up and lock them away for a 3-day evaluation because somebody feels like doing it.
Here's a place to start reading definitions, procedures and requirements in the Code of Virginia.
http://leg1.state.va.us/cgi-bin/legp504.exe?000+cod+37.2-809