What was the job for? Did you say that you stutter in the interview? At the bottom of my CV it says I have a stutter. In interviews, I say I have a stutter and it is a little worse in interviews because they are stressful and I dont get to a lot of them. Normally it puts me at ease.  It is important for me that I address this and convince them that I perform better than my initial stutter. For some countries, this would be discrimination. Raising it may put your mate in an awkward spot though. Interviews are tough. I would say that this is just one of many. I sent out 30 CVs and did 6 screenings/interviews before I landed this job.