From a systemic perspective, we can't correct for bad science until better science disproves it and becomes common enough knowledge. Unless you're both a parent and a cutting edge scientist in the field being employed against you, this is true at an individual level too. Incompetent application can, with transparent processes, be investigated by the defending party/parent/lawyer and be argued against. Or if the investigation can't be completed until after the children have been seized, corrections can be made and damages can be pursued.