Krages.com (PDF)

In the event you are threatened with detention or asked to surrender your film, asking the following questions can help ensure that you will have the evidence to enforce your legal rights:

1. What is the person’s name?
2. Who is their employer?
3. Are you free to leave? If not, how do they intend to stop you if you decide to leave? What legal basis do they assert for the detention?
4. Likewise, if they demand your film, what legal basis do they assert for the confiscation?