how can you make sure that your partner is not “using” again?

Question by michael30texas: how can you make sure that your partner is not “using” again?
my ex and i are talking about getting back together, but the reason that we split up is because she was doing a lot of drugs. We have been split up for over a yearand 1/2 and in that time she has gone through rehab and is in narcanon. My question is if she starts using again, what signs should i be looking for if we do get back together. She was doing uppers (coke and meth i know for sure). She has been clean for a year next week. I would agree that i should look for ‘chang in her personality,’ and i do know her personality (we dated for nearly 3 yrs, but i dont know how long in that time that she was using.
I just need to know what signs I should look for.
and please real answers only. If you just want 2 points, just say IDK.
thanks everyone in advance

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