So, Holly. The answer is that no-one here believes the parents were directly involved in MM's disappearance. There nay be people here who haven't ruled it out, but that's a different question.
There are people here who have ruled the parents out. They believe passionately that the parenrs are completely innocent.
I think it's best to keep an open mind but imo I think it's
unlikely the parents were involved but I see why others are 'skeptical' mainly I think because the aftermath was surreal coupled with imo the bizarre and crazy "childcare arrangements".
I've explained what I learned about the science of sleep on my psychology course and the fact certain stages are difficult to wake from, more so for small children. I put a link up for the video clip of SM being carried down the aircraft steps by GM where he then spoke into a microphone with the aircraft engines whirring in the background. SM remained fast asleep. So for me the idea the children were drugged or given massive doses of Calpol to knock them out by either the McCanns or a some would be abductor doesn't ring true.
Afaik no forensic service provider in the UK offers tests using detection dogs. No one has been able to cite any other UK case where they've been used in a criminal trial. In this case I think they amount to junk science on par with say lie detector tests.
I know from my research into the Bamber case where the same DNA tests were carried ie LCN DNA that this type of DNA testing is capable of producing a result from a sample the size of one millionth of the size of a grain of salt and in most cases is not even capable of confirming the biological material eg skin cells, sweat, saliva. Its fraught with problems over contamination and statistical analysis. In the Bamber case three appeal court judges ruled the results were "completely meaningless" because the possibility of all sorts of contamination could not be ruled out. MM's DNA would be all over the place and transferred to other places too even after her disappearance so meaningless imo.