Dad- Really, seeking legal advice from me is like seeking diet advice from Roseanne. Probably not a wise move....
LEGAL is defined by the law where YOU are- as I understand the law HERE- in a public space, where you have a right to be, where there is NOT a valid security concern, it is not against the law to film, record, yada yada.
At the same time- trying to get so close that it interferes with a LEO, EMT, firefighter, etc- it ain't the taping that is the issue- it is your proximity. Likewise shining a camera light in the face of the persons, wanting to tape while standing in the pool of spilled gasoline etc.
As far as Rodney goes, dashcam or privately owned cam- if it has recorded misconduct, THAT is the concern- not who owns it. However, same event from different locations can appear different. And simply being seriously pissed at the guy you arrested does not give you carte blanche to smack the snot outa him.
And no, 'Gello- Pink Palace.
Char- You are going to have different LEOs, different levels of training, experience, and understanding of what their job is. Places like Baltimore seem to accumulate twits.