Yes, it is common for everyone to have some exemptions in their CBSA notes. These exemptions are there to protect sensitive information that could be harmful if it were released to the public.
The exemptions that you listed are all related to protecting sensitive information.
- 13(1)(a) Obtained in confidence from a government of a foreign state This exemption protects information that was obtained in confidence from a foreign government. This information could be harmful if it were released to the public, as it could reveal sensitive information about the foreign government or its operations.
- 15(1) Prevention of subversive activities This exemption protects information that is related to the prevention of subversive activities. Subversive activities are those that are intended to overthrow or undermine the government of Canada. This exemption protects information that could be used by subversive groups to plan or carry out their activities.
- 16(1)(c) Injurious to the enforcement of any law of Canada or a province or the conduct of lawful investigations This exemption protects information that could be harmful to the enforcement of the law or the conduct of lawful investigations. This information could include information about ongoing investigations, the identities of informants, or the methods used by law enforcement to gather evidence.
- 19(1) Personal information of another individual This exemption protects personal information about another individual. This information could be harmful if it were released to the public, as it could reveal sensitive information about the individual's private life.
It is important to note that these are just a few of the exemptions that can be found in CBSA notes. There are many other exemptions that are used to protect sensitive information.