Understand the realities of "possession" laws. Example: I put drugs in your pocket, then you are arrested, now you are guilty of possession.
The legal onus is on you to prove your innocence, e.g. by a witness statement or a CCTV recording.
If someone uploads CP here, it gets downloaded automatically onto thousands of computers, and each owner of those computers if guilty of possession, even if they are deleted. Look at the HRC email situation–a lot of that concerns possession of classified info, even though it was deleted with Bleachbit.
Smarten up and realize we are at war. In an adverse situation we need to take defensive measures. If you can't handle that you're maladaptive, like an old dog. Improvise, Adapt and Overcome!