When is a Journalist not a Journalist?

An article published to the Contra Costs Times caught my attention earlier. It addressed the case of a gentleman at UC Berkley who stirred the question of what a journalist is expected to be doing while acting as a journalist covering a situation. I addressed the issue and my perception of it based on the Contra Costa Times article on Freelancer's Office in my article Journalist or Student Protestor, so will let you read there if you want the whole picture.

Here I just want to know what you think: When covering events, when is a journalist no longer acting in the capacity of a journalist? I would love to hear not only from writers and journalists, but the perspective of non-writers as well.