A decision last week by Germany’s Federal Supreme Court to acquit a gynaecologist of illegal abortion after he chose to carry out genetic diagnosis on several human embryos and discarded those with genetic defects has stirred a debate about the possible need for a new law tightening the rules on preimplantation genetic diagnosis. The landmark ruling said that embryos created from in vitro fertilisation (IVF) can be screened for genetic defects before being implanted in the womb. The 47 year old doctor, who was not identified, brought the case to court himself in 2006 to clarify the legal situation. He had already been acquitted in May 2009 by a regional court in Berlin, but the prosecutor had appealed the decision.