I want to know the answer to the following question:
When did Sheptycki write about police cooperation?
All the background I'm provided with is that "A notable exception is James Sheptycki's study of police cooperation in the English Channel region (2002), which provides a systematic content analysis of information exchange files and a description of how these transnational information and intelligence exchanges are transformed into police case-work.". Is that enough to answer the question?
Answer: yes