Legal observers should not become involved in crowd control, conflict resolution, or speaking for demonstrators. Police officers and the media will always be looking for leaders to negotiate with or speak with. Be direct with them that you are here as an observer and that you are only here as an observer. It is important that the observer not do anything to detract from that credibility. During the time they are observers, they do not engage in activity that could be confused with that of a demonstrator.
Legal observers tend to be more likely to risk arrest.
They should conduct themselves accordingly. This means no drugs. No drugs in system. Also no weapons. They should have identification at all times.