I've actually been arrested once for recording a police officer, I went up to her with my cellphone in hand when she was questioning my intoxicated friend on my college campus. She snatched my phone away from me and said I was prohibiting her from doing her job, and so I was taken in with my friend. Looks like i'll be fighting this one. Never thought HN would be a good source for legal advice ;)
Translation: You've done something that I don't like, but isn't illegal, so here's a trumped up charge so you have to spend the night in jail.