Question about Vasectomy test results?

Because there is still live sperm stored in his "junk". He's suppose to 10/20 times in the days following his vasectomy to rid himself of the live sperm leaving "empty" semen. Apparently the first sample wasn't "blank" enough for them to say it was clear to have again....this is why you're suppose to follow doctors orders!!!! I know it's hard sometimes but it's easier than raising another child.