If a cop saw this, he would be calling backup and dealing with it immediately. Not wait for the person to leave to then search the house and not attempt to apprehend the person commiting the crime. Id be fine with my house being searched if the cops saw me storing a tempest of drugs, attempted to stop me, and I slaughtered the cops and left after storing the drugs. The problem lies with cops having a "house map" and camping houses, not intending to actually catch anyone and take them in, but just watching so they can wait for someone to leave and take the drugs the easy way while avoiding any RP or conflict.
Also the problem lies in the fact that if someone simply walks into a house it can be searched, regardless of any other factors, their house or not. This is horrible for scats, which is a huge portion of the community.