"E. FOR THE PURPOSES OF THIS SECTION, "LAW ENFORCEMENT ACTIVITY"
MEANS ANY OF THE FOLLOWING:
1. QUESTIONING A SUSPICIOUS PERSON.
2. CONDUCTING AN ARREST, ISSUING A SUMMONS OR ENFORCING THE LAW.
3. HANDLING AN EMOTIONALLY DISTURBED OR DISORDERLY PERSON WHO IS
EXHIBITING ABNORMAL BEHAVIOR."
Given worldwide 'shot by cop' statistics, i would put '..AN EMOTIONALLY DISTURBED OR DISORDERLY PERSON WHO IS EXHIBITING ABNORMAL BEHAVIOR." as a valid label for US cops.
And if they approach you to conduct "law enforcement activity" on you, you're effectively exempted and allowed to film. https://www.azleg.gov/legtext/55leg/2R/bills/HB2319S.pdf