Often someone will be questioned and offered a 'plea deal' to:

a) get a confession from the person being questioned, OR
b) allow the real crook to let his/her guard down and be more easily caught, OR
c) that the real crook might come forward and admit their guilt rather than let an innocent person be charged. This is NOT likely, IMO, unless it is a first offense.

I don't know if Mrs McCann is guilty or not...I can see an accident happening and the coverup occurring out of sheer panic. But to have it extend to pulling the wool over the eyes of the civilized world???

There is method in the investigators' madness, I suspect - and they aren't making it public, because criminals have TVs and internet too.

I just hope all is solved for the best...