There are two ways to go about it:
1. Under (1)b it is specified that private conversations cannot be recorded. An officer acting in official duty is always considered acting in a public manner: there is no expectation or right of privacy for public officials.
2. Under (2), it is specified that an exception to the rule is when recording "other unlawful requests or demands." A public official stating that they will persecute you or continue to violate your 4th amendment rights unless you obey their orders is making an unlawful demand.