Off topic but this is what Kate reveals in her book, Madeleine:
On the drive home from the police station it had become clear to Gerry that Carlos believed charges were likely and that we might have to stay in Portugal. The preparation of a case like this could take years. If the charge was murder, rather than the lesser crime of hiding a body, we might even be remanded in custody for all that time. Given the lack of evidence, it was impossible to understand how such charges could be brought, but if you’d told us a few weeks earlier that we were going to be declared arguidos we wouldn’t have believed that, either. The prospect of being separated from Sean and Amelie, holed up in jail unable to prepare our defence properly, was terrifying. Gerry was seriously considering sneaking us into a car and driving us all across the border to Spain. It would have been crazy. The whole world would have thought we were guilty, and maybe that was what the police were hoping we’d do. Most people find it hard to comprehend how innocent people can confess to crimes they haven’t committed. Gerry and I don’t. Not now. The monumental psychological duress we were under can easily lead to bad, irrational decision-making. Thankfuly, we resisted the urge to flee. When we left Portugal, it would be with the blessing of the PJ and our heads held high.