13-2904. Disorderly conduct; classification
2. Makes unreasonable noise;
13-2409. Obstructing criminal investigations or prosecutions; classification
A person who knowingly attempts by means of bribery, misrepresentation, intimidation or force or threats of force to obstruct,
delay or prevent the communication of information or testimony relating
to a violation of any criminal statute to a peace officer, magistrate, prosecutor or grand jury or who knowingly injures another in his person or property on account of the giving by the latter or by any other person of any such information or testimony to a peace officer, magistrate, prosecutor or grand jury is guilty of a class 5 felony, except that it is a class 3 felony if the person commits the offense with the intent to promote, further or assist a criminal street gang.
Soooo, this is your Arizona Statute. You're telling me, that none of this would apply to a "obnoxious, belligerent or whatever other adjective" police observer.