Two party consent when recording with audio is still an issue in MA.

Simon Glik, a lawyer, was walking down Tremont Street in Boston when he saw three police officers struggling to extract a plastic bag from a teenager’s mouth. Thinking their force seemed excessive for a drug arrest, Glik pulled out his cellphone and began recording. Within minutes, Glik said, he was in handcuffs.
“One of the officers asked me whether my phone had audio recording capabilities,’’ Glik, 33, said recently of the incident, which took place in October 2007. Glik acknowledged that it did, and then, he said, “my phone was seized, and I was arrested.’’ The charge? Illegal electronic surveillance.
In 1968, Massachusetts became a “two-party’’ consent state, one of 12 currently in the country. Two-party consent means that all parties to a conversation must agree to be recorded on a telephone or other audio device; otherwise, the recording of conversation is illegal. The law, intended to protect the privacy rights of individuals, appears to have been triggered by a series of high-profile cases involving private detectives who were recording people without their consent.
In arresting people such as Glik and Surmacz, police are saying that they have not consented to being recorded, that their privacy rights have therefore been violated, and that the citizen action was criminal

Link:
http://www.boston.com/news/local/massachusetts/articles/2010/01/12/police_fight_cellphone_recordings/