From Atrios:

We went over to the commanding officer and I, calmly and politely, sought to explain that I didn't know why this cop was continuing to hassle me. The first cop kept interrupting me as I tried to explain myself and finally I turned around and said, "Can I please finish a sentence here?" That's when the first cop decided to arrest me. He handcuffed me behind my back and took me outside.

No word on where Ana Marie Cox was at the time.