The new ethical controversy?

[Clodfobble]

Originally Posted by glatt

Well, there is amniocentesis, but it's a little risky, and it's never done routinely because of that risk. Around 1% of fetuses are killed by the procedure.

For some reason I thought an amnio couldn't be used for Down's testing, but a quick Google search shows I'm clearly wrong. What I don't get is how the test could be wrong, as in lookout's anecdote. Either the extra chromosome is there or it isn't... LabRat? Any clues?