expressions 
 
 criminal investigation, cross border case, request for mutual legal assistance, confidentiality of the request, compelling public interest, undisclosed source of information, maintaining confidentiality, freedom of speech and expression, balancing exercise, right to the protection of privacy, right of the public to information, right to access to information, the aspect of non-disclosure, evidence gathering stage, reasonable expectation

Which of these are difficult for you to remember? 
Can you come up with a sentence discribing how these are related to the case?