http://joana-morais.blogspot.com/2008/02/theory-of-abduction-of-madeleine-mccann.html
15. Refusing a Urine Test on the Twins.
The McCanns, both doctors, refused urine tests for their two-year-old twins, although they later admitted that the children "could have been drugged by the abductor". The parents then waited for five months before engaging an agency to carry out "independent" tests. The results of these tests have never been publicly disclosed and it is not known for what drugs the agency tested.
These allegations regarding the refusal of initial testing were reported in the Portuguese press.
I tend to think that the reports are true for one main reason. If they had agreed to drug testing for the twins immediately, that information would surely have been reported all along, especially in the British press.
Ask yourself this, if your two small children had been left behind during an abduction and they did not wake up during all the activity while people and police searched and with KM screaming for Maddie....would you ask that they be tested for some sort of sedative-type drug that might still be in their systems?