Imo if you have anything out on display, if the authorities come a knock, knock, knocking on your door, then you are obviously completely fucked, obviously depending very heavily on what it is they find, one gram of an RC and it is promised that it will not lead to any prosecutions, but any old school drug /anything recognizable by the police and you are gonna be fucked. However, certain forces take a lenient approach to cannabis products too. If they have any further suspicions they may well search all immediately accessible drawers and cupboards and hiding places too etc. They may have sniffer dogs.
Finally there are many hiding places that can be found within the structure of houses, or semi-structural components within houses, particularly in old houses, and the structure can be made good afterwards. I really cannot see the police going to the extent of completely gutting a house, especially if they've found no evidence to go on. Recently my neighbors have been so nosy and interfering, i believe they have even phoned the police about me several times, on one occasion i gathered that they were coming very soon, so i immediately started hiding everything away as well as possible.
I have actually hidden some 1Ps so well that i cannot find them at all, even after turning every room in the house practically upside down, and also everything else was such a pain in the arse to simply get to that ive just gone back to my old ways over the weeks that the police never turned up, in the hope that keeping the noise down at night and going to bed as early as possible will prevent another police call. I strongly get the feeling that the police really just do not want to get involved, having received letters in the immediate aftermath of one of these 'noisy late nights' referring me to my GP to asses my mental health!