Once acquitted, one cannot be prosecuted again, the so called “ne bis in idem” principle. This is rooted in the European fundamental human rights. Reopening a case because new evidence is found to set free a wrongfully convicted person is (of course) possible, but the reverse is not. A few politicians here are challenging the principle, based on a cold case where new DNA evidence brought pretty strong proof an earlier acquitted person most probably is guilty after all.
The highest court put out serious warning to the politicians that this route might bring us on a collision course with European treaties. Not only that, it is utterly stupid and cheap scoring imho. One of the foundations of a democracy is an absolute trust in it’s justice system, leading to a “better a hundred criminals set free, instead of one wrongly convicted” attitude. Unheard of. Or is it?