Why was a Portuguese cop under investigation himself on a similar case allowed to be involved with McCann case

One of the Portuguese policemen involved in the McCann investigation is himself under scrutiny for torturing a Portuguese woman into a confession involving the disappearance of one of her children. He could himself be involved in the abduction of children including Madeleine and is in the perfect position to deliberately mislead the investigation and to plant forensic evidence to frame the McCann's, hence the sinister turn of focus onto them. He could be behind the leaks to the Portuguese media that are whipping the public up against them knowing that it would play to their national shame at such international scrutiny and also cultural differences - Kate is keeping her composure in public and the fiery continental mentality can't fathom this perceived lack of emotion so are quick to jump to conclusions. Nightmare on nightmare. Let's hope the truth comes out.