My Mom has a problem with my brother steeling because of addiction (not meds just anything he can get his hands on to sell). My Mom locks everything important in her car and sleeps with the keys. I agree to lock the meds up, don't even let him you have them, tell him your not taking them anymore. I hate to advise anyone to lie but he has a problem and you don't need him to try and pry it open your lock box. (my brother got into my moms lock box). Good luck.