CHAPTER IV: OTHER FORMS OF COOPERATION
SECTION III: PROCEDURE
Art. 44 National Security
1 If the Central Authority has serious grounds to believe that the execution of a request could prejudice national security interests, it shall immediately inform the Department.
2 Where paragraph 1 applies, the Department may suspend execution measures.
3 Upon request of the Department, the Federal Council shall deny the request of the Court for cooperation, to the extent that granting the request would prejudice national security.
Protection of national security
Refusal of ICC request - protection of national security
EDIT.