drug abuse question please help?

I know someone that tested her husband for meth because he was acting strange and he was dirty for it the question is he says he stopped and he has been eating but every few days or so he will stay up all night working on the computer and tells her that its because he wants to finish what ever it is he is doing and she thinks he may still be using Im not sure and she is not sure because he eats ok and she says he has more of attitude problem now then before any advice fyi she asked him to take another drug test to make sure he is not using and he said no he wanted to wait a month to make sure it was out of his system before he took another.

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