Anyone else having trouble finding suspects in the detective career path?

I had the same problem, 6 clues and all matched one woman who was always around. I interrogated her and she was found innocent, then I tried to arrest her again and got performance loss. So I just quit the job and rejoined (she started at level 3 this time), got a new case and solved it successfully. So it was only the first case that was bugged for me so far, but it was really very frustrating.