Nervous!!

My husband has a job interview today after work, this job is an answer to our prayers and he is really nervous!  He just recently quit a very bad habit he has had since 13.  I'm proud of him to say the least since I have watched him struggle with his addiction for 11 years.  Anyway he quit smoking weed 3 1/2 weeks ago!  I know he has to take a pre employment screen for this job, will he be okay?  Or should he give his other work a 1 week notice so he can get that extra week to  pee clean???