As soon as I read your first rule I thought "that's out the door", all addicts lie, and they lie when they're using, and they are very good at. I've had many of them lie to me when I worked as a resident manager, I'd drug test them and they'd swear up and down that there was something wrong with the test or "I ate a poppy seed bagel". I don't what your brother's drug of choice is, but expecting him not to lie is what he's probably used to doing to get what he wants. He only spent one month in rehab and left AMA, against medical advise... The whole thing sounds like you better hide everything that's worth any dollar amount to you, hide the alcohol and wallets, and don't give him any money, just food, water, and give him a ride to job interviews, if that.
Good luck.