This is why it is important not to say anything about the CTB project, the product (SN here), the method used, the place, etc. No one should know. It is to avoid the confiscation of his freedom, by forced and undesired hospitalization, searches, the confiscation of everything that could be used for the CTB...
You can talk about the CTB if you need it knowing the risk of hospitalization against your will, but not to talk about the methods, the place, when the CTB will be done! This is to avoid the confiscation of products, weapons... being watched, wiretapped,... then being arrested during an attempted CTB.
Psychiatrists, police, ... always ask you questions like, when are you going to CTB, with what method, where, ... it's a trap.