Not true. Warrents don't take that long, the police can "hold" you for 48-72 hrs without cause while they get a warrent, and the execptions to the warrent requierment are numerous. Best not to get arrested rather than hope that the courts will throw out the evidence in a year or 2.
This is true. They also have to have probable cause for a search warrant. I'm PRETTY SURE a couple locked doors in a house with 3 different people that AREN'T family isn't grounds.
You can't even smell the plants IN the room, unless your face is all right up in them.
This is also why I treat my landlord with the utmost respect and I dread the day I have to ask her to leave the property based on legal grounds. I hope that doesn't happen.