Clutching at Straws

Ok, which sounds the more plausible explanation to you:-

a) two experienced doctors mistakenly give their child sedatives and kill her. Whilst dining out with friends that evening, showing no signs of having committed a terrible crime they manage to stash the child's body out of sight and declare her to have been abducted. Despite having had the apartment they were staying in and the holiday complex searched, and being in the glare of the media spotlight, they somehow manage to conceal the body from the police for over three weeks before burying it.

b) having failed to conduct an investigation that would in any sense conform to the word "competent", the Portuguese police call in a British forensics team many weeks after the child has disappeared. They find a spot of blood that partially matches the child's DNA. The Portuguese police furrow their brows and think hard. Tired of being called incompetent by the rest of the world for, erm, being incompetent, realising that local feeling seems to be turning against the parents, aware of press reports blaming the parents for the child's disappearance, they decide to accuse the parents of accidentally killing the child in scenario a) (see above). The whole sorry mess can then go away, they can stop wasting resources looking for a murdered child, and go back to doing what they normally spend their days doing. Directing traffic and the like.

After much serious consideration, I'm going for option b). I just don't buy the McCanns having anything to do with the disappearance of their daughter. Of course, if the next lot of forensic results due in prove beyond a shadow of doubt that they were responsible, then I shall put my hands up and declare them to be master criminals with more front than Brighton. And probably delete this post :-)