Look at this picture.
Dr Cassidy said her mortuary technician knows on sight that its a toy. He has a wicked sense of humour, she said, and in front of the open-mouthed gardaĆ will throw the doll against the wall, telling them that's how he checks its not a foetus.
I can see how they make the mistake, but it's still pretty funny. And, how do the Guards react when she tells them that their fetus is a plastic alien? "They bounce".
The fact that doctors frequently make the same mistake is worrying, however.