Is it possible to be raided and them NOT find your stash?

I own quite the LARGE home, 3 bed 2 bath vaulted ceilings with a 2 car garage that has its own storage attic above it with TONS of boxes upon boxes of stuff up there, a completely full garage, and honestly it got me thinking today walking around the house. THERE'S SO many places to hide stuff it's unrealistic. Literally I saw over 200 good places that I feel my drugs wouldn't be found, I'm speaking specifically of LSD.

What are the chances if I were to get raided that they wouldn't find the drugs. I mean if I went to the extent of even hiding them behind the power sockets would they really go and unscrew my outlits and search my walls?