Drug addiction is a powerful force that can turn people into thieves. Even family members can't be trusted. Always have your drugs in a secure location.
I clean my own house, even tho I don't do that great at it. Last time I lived at my FIL's house, he had a maid that came in every week to clean. One day she brought her grown niece to help her, and a very expensive and sentimental bottle of perfume my husband had given me while we were engaged "disappeared". Wonder what else she lifted out of the house?