OK... supposing we accept for a moment that those who suggest that the McCanns killed Maddie are correct... where the hell did they hide the body and why hasn't it been found?
I'm quite sure that whole surrounding area will have been gone over with a fine tooth comb - probably more than in a regular disappearance, especially with Maddie being so young!
Also, when did her parents have the opportunity to dispose of her body and where did they hide it?
I dont think the McCanns killed Maddie or at least not intentionally anyway, there was talk of Maddie being administered sedatives, though surely, being medical professionals even if they did give her sedatives, they would have given her a correct amount of dosage.
If on the other hand it was calculated and the intention was to kill Maddie, then giving her just the right amount of sedative to induce death would have been easy for them as they would have the knowledge to give the exact dosage, though I doubt calpol could do it.